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KATRIN_1 [288]
3 years ago
8

Which describes oxygen content as Earth evolved over time? Oxygen levels sharply declined about 400 million years ago. Oxygen le

vels stay above 15 percent starting 200 million years ago Oxygen levels remain below 5 percent starting 1000 million years ago. Oxygen levels raise significantly between 1000 and 700 million years ago.
Biology
2 answers:
lora16 [44]3 years ago
5 0

Answer:

b

Explanation:

tankabanditka [31]3 years ago
4 0

the correct answer is b. i just took the quiz

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Radda [10]

Answer:

Antipsychotic drugs have been developed to target both the positive symptoms AND the negative symptoms of schizophrenia by targeting both dopamine and serotonin receptors in the brain.

Explanation:

Schizophrenia is a disorder that affects the ability of a person to feel things, think and behave accordingly. There are several symptoms of schizophrenia like hallucinations, social isolation, responding inappropriately to surroundings and stimulus, being emotionally vulnerable, in severe cases an individual may try to harm themselves and become extremely aggressive. Dopamine and serotonin both play vital roles in schizophrenia. It was detected that dopamine levels were low in patients suffering from schizophrenia. Thus, antipsychotic drugs were developed which affected the receptors of dopamine and serotonin, sequentially reducing symptoms and effects of schizophrenia.

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1 year ago
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The main function of the large central vacuole in plant cells is to provide structural support; however, it serves other functions such as protection, storage, growth and waste disposal.

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3 years ago
What is a gene? PLEASEEEEEEEE ANSWER FASTTTTTT
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A gene is (in informal use) a unit of heredity which is transferred from a parent to offspring and is held to determine some characteristic of the offspring.

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3 years ago
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How can we save endangered animals?
Roman55 [17]

Answer:

There are a couple ways to save endangered animals.

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First off, spreading awareness and attention about the topic of endangered animals is important so more people can talk about it. Secondly, you can donate to some organizations helping with species endangerment. Also boycotting your favorite clothing brands that may include harming animals can help.

6 0
3 years ago
A woman takes a man to court claiming that he is the father of her son and that the man should be required to pay child support.
Anastasy [175]

Answer: No

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