The organelle that maintains pressure against the cell wall, so that the plant cell keeps it shape, is thea. central vacuole.
b. rough endoplasmic reticulum.
c. smooth endoplasmic reticulum.
d. nucleus.

Answers

Answer 1

Answer: a. The central vacuole. Aside from storage it also helps maintain internal pressure.

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One reason why people should be aware of the impact of their actions on the environment is that

Answers

There is a nature law every actions has reaction. So when human being impact the environment in any way such as pollution, global warming etc., environment results to rise in the sea level or increase of disease that results to the death of the human beings.

What is environment?

Environment is defined as a sum total of all the non-living or living elements and their effects that influence human life.

Protect our water supply and keep our air cleaner and awareness in the people is only way to protect the environment. Other main important method to protect the environment is reuse, reduce, recycle.

For more details regarding environment, visit:

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if someone is aware of their actions on the environment that gives them the opportunity or the ability to change what their actions are there for bettering the environment

Where do you find tundra?A. At high elevations
B. In Antarctica
C. North of the Arctic Circle
D. North of the Arctic Circle and at high elevations

Answers

The answer is D.North of the Arctic Circle and at high elevations

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Which is a quality that is part of a person's nature?A. The time of year when he or she was born
B. The color of his or her eyes
C. The size of the city where he or she was born
D. The language spoken at his or her school

Answers

Answer:

B the color of his or hers eyes

Explanation:

Apex

What are the three main parts of the geosphere?lithosphere, crust, core
hydrosphere, crust, core
lithosphere, mantle, core
crust, mantle, core

Answers

The correct answer is crust, mantle, and the core. The Lithosphere and the hydrosphere are a part of the atmosphere.

Answer:

crust, mantle, and the core

Explanation:

Nicotine acts in the brain by: Multiple Choice increasing serotonin reuptake. enhancing GABA's inhibitory effects. reducing blood flow to the cerebral cortex. first stimulating and then blocking cholinergic receptors.

Answers

Answer:

first stimulating and then blocking cholinergic receptors

Explanation:

Nicotine is a type of stimulant that is chemically alkaloid. It works as the receptor agonist at the nicotinic acetylcholine receptor. It is a type of addictive chemical that increases the blood flow, heart rate and some biochemical reactions of the body. In the brain, it has stimulation as well as blocking effect. Medically, it is used for various purposes such as quitting smoking and some other.

Final answer:

Nicotine stimulates and then blocks cholinergic receptors in the brain, leading to both stimulating and relaxing effects.

Explanation:

Nicotine acts in the brain by first stimulating and then blocking cholinergic receptors. It first acts as a stimulant, increasing the release of acetylcholine, which causes excitatory effects in the brain. Eventually, the cholinergic receptors become desensitized and eventually blocked, leading to a reduction in acetylcholine's activity. This process helps explain why tobacco usage can both stimulate and relax users. When nicotine binds to these receptors, it activates them, leading to the release of dopamine and other neurotransmitters, producing pleasurable effects.