Air pollution is best defined as ________.

Biology

1 answer:

Tresset [83]3 years ago

3 0

Answer;

A. gases or particles present in high enough concentrations in the atmosphere to harm humans, other organisms and structures.

Explanation;

Air pollution is a type of pollution that occurs when harmful or excessive substances such as particulates, gases and biological molecules are introduced into Earth's atmosphere.

The burning of fossil fuels, such as coal, oil, natural gas, and gasoline to produce electricity and power our vehicles is the major cause of air pollution.

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* Describe at what point in the cell cycle cells begin to divide uncontrollably.

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Every cell in the body goes through a life cycle. Cells grow and divide to replace cells that are lost because of normal wear and tear or injury. Different cells grow and die at different rates. Some cells, such as epithelialepithelialA thin layer of epithelial cells that makes up the outer surfaces of the body (the skin) and lines hollow organs, glands and all passages of the respiratory, digestive, reproductive and urinary systems. cells, reproduce quickly. Other cells, like nerve cells, grow slowly. Both normal cells and cancer cells go through a sequence of steps, or phases, when they form new cells. This is called the cell cycle.

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3 years ago

A damages axon in the PNS may be able to regenerate only if the cell body is intact. Why do you think that the cell body must be

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Answer:

Explanation:

The central nervous system (CNS) does not have capacity to repair itself but, the PNS or the peripheral nervous system can repair and regenerate itself. The PNS can regenerate its damaged axon only when its cell body or cyton and its neurilemma are intact. The proximal end of the cyton has growth cones. The axon grows from the cones.

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How can different amino acids affect secondary structure

Igoryamba

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Exposure to positively charged amino acids (arginine and lysine) is found to clearly stabilize the secondary structure. Kinetically, each amino acid promotes folding by generating a large increase in the folding rate with little change in the unfolding rate.

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2 years ago

One part of a freely swinging magnet always points

saul85 [17]

The best answer is D

A freely suspended magnet will always point in the North - South direction in the absence of any other magnet. This suggests that the earth itself behaves as a magnet which causes a freely suspended magnet (or magnetic needle ) to point always in a particular direction namely North and South.

The south pole of the earth's magnet is in the geographic north because it attracts the north pole of the suspended magnet and vice versa. However it is important to note that the position of earth's magnetic poles are not well defined because they are spread over an area.

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3 years ago

Living things need energy Your essay need to include; producer consumer decomposer

aev [14]

Answer/Explanation:

<h3>∴ ║ Living Things Need Energy ║∴</h3>

The ability to obtain and use energy is one of the eight characteristics of all living things. Scientists classify organisms based on how they get their energy: autotrophs or heterotrophs. Organisms are divided into three main groups- the producers, the consumers and the decomposers.

Producers get their energy from abiotic factors (non-living sources). Most producers are plants and get their energy directly from the sun using a process called photosynthesis. There are also some bacteria that can make their own food from chemicals using a process call chemosynthesis. Examples of common producers are grasses, trees and flowers. Algae (which are protists, not plants) are the main producers in aquatic ecosystems. Remember we call these autotrophs because they can make their own food.

Consumers cannot make their own food. Instead, they get their energy by eating other organisms. These are also called heterotrophs. There are many types of consumers. Herbivores, such as grasshoppers and prairie dogs, only eat producers. Carnivores eat animals. Coyotes, badgers, and falcons are all carnivores. Organisms that eat both producers and other consumers are known as omnivores. Most humans are omnivores. Scavengers are a special type of omnivore. They eat dead plants and animals. Vultures and many insects are common scavengers.

Decomposers are a very special type of heterotroph because they get energy by breaking down dead or dying organisms. Bacteria and fungi (mushrooms, molds and mildews) are examples of decomposers. Decomposers are important to ecosystems because they return important nutrients such as water, carbon dioxide and nitrogen to the soil. Plants then use these nutrients to grow, creating a cycle of nutrients through the ecosystem.

Each of these organisms depends on the others. Producers get energy from the sun or chemicals and then give some of this energy to consumers. The consumers then give some of their energy to the decomposers. Together, these organisms form a food chain. A food chain is a series of events in which food energy is transferred from one organism to another. All food chains have the basic structure of producer ⇒ primary consumer ⇒ secondary consumer ⇒ tertiary consumer ⇒ decomposer. There are many overlapping food chains in an ecosystem. These overlapping food chains are known as a food web.

As energy passes from level to the level in a food chain within a food web, the amount that each organism receives decreases. For example, in a grassland ecosystem, the grasses get energy needed for life from the sun. Some of this energy is used by the grass to grow and reproduce. When a prairie dog eats the grass, it only gets 10% of the energy the grass originally had. The prairie dog then uses some of the energy from the grass to grow and reproduce. When a coyote eats the prairie dog, it only gets 10% of the energy the prairie dog originally had. This decrease in energy at each level of the food chain can be represented by an energy pyramid.

~Learn with Lenvy~

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2 years ago

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