A-Level Environmental Science exam question:

Since the 1950s, the exploitation of the rare-earth elements has increased from a few tonnes per year to over 150 000t per year. They are used in a wide range of applications, including new developments in transport, electronics and healthcare.
Although the main metals used following the industrial revolution are still important, economic development since the mid 1900s has involved the use of relatively small quantities of a much wider range of metals.
Many rare-earth elements have a relatively high mean crustal abundance, but they rarely occur in locally concentrated deposits.
Figure 1.1 shows details of the reserves and production of rare-earth elements in seven countries.
Use the data in figure 1b to calculate the missing values

Answer:

1. generation or birth or gender) is a basic unit of heredity and a sequence of nucleotides in DNA that encodes the synthesis of a gene product, either RNA or protein.

2: 1. Body cells make up the body of any multicellular organism. On the other hand, a gamete is a sex cell that can either be a sperm or egg cell.

2. Body cells undergo the process of mitosis while gametes undergo a process called meiosis.

3. A body cell contains a complete number of chromosomes and is called a diploid cell while a gamete contains only half the number of chromosomes of its parent cell, and it is called a haploid cell.

3. Identical twins

4. nucleotide triplets

5. A gene is a sequence of nucleotide bases that specifies certain products; RNA or proteins. It is the segment of DNA that holds the information to build and maintain an organism's cell and also pass genetic traits to offspring. Hence, it is the molecular unit of heredity in living organisms.

The DNA is a long double-helical structure that stores the genetic information in our cells. It consists of two long polynucleotide chains composed of the four nucleotides subunits (A, C, G, T).

In order for the long strand of DNA to fit into the cell's nucleus, it is coiled around certain proteins called HISTONES to form Chromatin, which undergoes further coiling and organization to to linear CHROMOSOMES.

The chromosomes are structured within the nucleus, that are made up of the cell's genetic material (DNA). In eukaryotic cells, the nucleus houses the cell's DNA and directs protein synthesis (expression of the information encoded by genes).

Explanation:

Answer:

no, pero es un show si es dime cual es el nombre del show

Answer:

clouds and precipitation that minimize temperature changes throughout the day

Explanation:

I just took the test and got an A on it

Answer:

d aa its not capitalized like the other ones

Explanation:

Answer:

Exocytosis, phagocytosis, and pinocytosis

Explanation:

Active transport is when energy is used to move substances across the cellular membrane.

Exocytosis requires energy to remove materials from the cell; it is active.

Phagocytosis also requires energy; it is active.

Diffusion isn't active because it moves materials down their concentration gradient and therefore it doesn't require energy.

Pinocytosis is a form of endocytosis and requires energy; it is active.

Answer:

the correct answer is sound

Answer:

the oldest living plant is seagrass colony

Explaination:

The plant is over 100000 years old

Answer:

human make enzymes to digest starch

Answer:

1 Nose

2 Mouth

3 Pharynx

4 Larynx

5 Trachea

6 Bronchi

7 Bronchioles

8 Alveoli

Explanation: are correct for your numbers in edg

Following are the parts of Respiratory system:

1.Nose

2. Mouth

3. Pharynx

4. Larynx

5. Trachea

6. Bronchi

7. Bronchioles

8. Alveoli

The respiratory system is the network of organs and tissues which helps with breathing that includes the airways, lungs, and blood vessels. The muscles that power the lungs are also part of the respiratory system. They work together to move oxygen throughout the body and to clean up waste gases like carbon dioxide.

Respiratory system consists of following parts like

Nose--> Mouth--> Pharynx --> Larynx --> Trachea --> Bronchi --> Bronchioles --> Alveoli

The respiratory system has many functions others than inhaling (breathe in) and exhaling (breathe out), it:

Thus, following are the parts of Respiratory system:

1.Nose

2. Mouth

3. Pharynx

4. Larynx

5. Trachea

6. Bronchi

7. Bronchioles

8. Alveoli

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Answer:

F2 generation

Explanation:

The shelf fungus and slug in the forest community do not compete with each other as they have the same habitat, but different niches. Thus, option A is correct.

Habitat is defined as the place where the species resides while the niche is the role of the specific organisms or the species in that particular habitat or environment. The niche includes the impact of the species on the habitat.

The shelf fungus and the slug both live on the side of the tree and hence have the same habitat but the fungus takes minerals from the tree and the slug from the algae making them differ in the niche.

Therefore, the fungus and slug have the same habitat but different niches.

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Answer:

Stimulus control

Explanation:

You are controlling the stimuli. Altering the environment to influence, in this case minimize, stimuli is an example of stimulus control.

Answer:

bread passes the test for starch

Reproduction in prokaryotes occurs primarily through the process known as Binary Fission.

Answer:

Replication

Explanation:

Answer:

boil

Explanation:

Answer: The steps used in scientific methods are to ask a question, form a hypothesis, test the hypothesis, analyze the results, draw conclusions, and communicate results. A controlled experiment tests only one factor at a time so that scientists can determine the effects of changes to just that one factor.

Answer:

The scientific method is the gold standard for exploring our natural world. You might have learned about it in school, but here’s a quick reminder: It’s the process that scientists use to understand everything from animal behavior to the forces that shape our planet—including climate change.

The more closely related two different species are, the more alike their cytochrome C amino acid sequences are. The cytochrome C is an evolutionarily conserved protein.

The cytochrome C  is an evolutionarily conserved protein involved in cellular respiration.

The cytochrome C is a carrier of electrons that acts during the oxidative phosphorylation stage of cellular respiration.

This protein is evolutionarily conserved in species whose cells generate ATP in anaerobic (oxygen presence) conditions, which means that generally synonymous mutations are observed when comparing the amino acids of this protein.

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Answer:

F1 Generation

Explanation:

In the study of genetics the offspring of the P generation is referred to as the F1 generation.

In the study of genetics, the offspring of the P generation are referred to as the F1 offspring, or first fillial offspring. Their genetic makeup depends on their parents.

Inheritance explains how the genes from the parents pass down to the offspring. An example is when both parents are tall because they are purebred, then all the F1 offspring are tall.

The T is represented by tall, and the t is represented by short. TT is purebred tall, and tt is purebred short. When two parents (P generation) are heterozygous for tallness, such as Tt, each will produce gametes such as T and t. From these gametes, three types of individuals are formed, such as purebred tall (TT), heterozygous tall (Tt), and purebred short (tt). These are called F1 offspring.

Hence,  in the study of genetics, the offspring of the P generation are referred to as the F1 offspring, or first fillial offspring.

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False.

There are several good mutations that have ensured the survival of species. Typically helpful mutations help the creature adapt to its environment or protect itself from predators.

I hope this helps! :)

Answer:

mouth, esophagus, stomach, small intestine, large intestine, rectum and anxs.

[tex] \bigstar \underline{ \large{ \sf{ \pink{Global \: \: Warming}}}} : [/tex]

______________________________

Answer:

1. carbohydrates help to produce a part of cellulose. carbohydrate produces the vital source of energy, carbon skeletons for organic compounds, and storage of components.

2. Amino acids help in the ion transportation, modulation of stomatal opening, maintaining the level of detoxification.

Waxy skin - some leaves have a thick, waxy skin on their surface. This reduces water loss by transpiration . Water storage - some plants, known as succulents, store water in their stems, leaves, roots or even fruits.

The waxy covering on plant leaves, young stems, and fruit is called the "cuticle". ... The purpose of this covering is to help the plant retain water. In arid regions, that is very important. In wetter regions, the waxy coating may help prevent infection by disease organisms.

Plants that grow in arid zones of USDA zones 9 to 11 use waxy leaves to limit transpiration and retain water but also to protect leaves from the frigid temperatures sometimes found in the desert. Trees like the desert willow (Chilopsis linearis) have narrow, waxy leaves and striking purple flowers.

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Answer:

the Biosphere

Explanation:

I searched it up.

Answer:

The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old.

Explanation:

distance

sun

day

night

The Earth's distance and position relative to the sun effects the lengths of day and night.

Answer:

True :)

Explanation:

Most species of flowering plants rely on vectors to move pollen and these vectors include insects, butterflies, birds, water and wind.