3 years ago

One natural cause of extinction would be the massive __________ that occurred in the 1800s.

2 answers:

6 0

Earth's history. In the worst one, 250 million years ago, 96 percent of marine species and 70 percent of land species died off. It took millions of years to recover.

NemiM [27]3 years ago

6 0

Answer: volcano

Explanation:

usatestprep multiple choice answer

You might be interested in

Multicellular organisms must be protected from the external environment. Because of this, cells of even the simplest multicellul

Vladimir [108]

Answer:

epithelial tissue

Explanation:

7 0

3 years ago

Read 2 more answers

What causes fractures in the litosphere? Select one: a. Physical stress b. Exogenic processes c. Endogenic processes d. Tensiona

ollegr [7]

i think its physical stress

4 0

3 years ago

Read 2 more answers

When the source of a wave is moving relative to an observer of the wave, which of the following is true?

galina1969 [7]

Answer:

Observers ahead of the wave observe an apparent increase in wave frequency

Explanation:

This is the Doppler Effect. The frequency of a wave increases when the source approaches the observer and decreases as the source recedes.

B, C, and D are wrong. Observers behind the source notice a decrease in frequency.

4 0

3 years ago

Which allele combination represents a female who is a carrier for an X-linked recessive disorder?

barxatty [35]

Answer:

dont sorry

Explanation:

8 0

3 years ago

Read 2 more answers

Scientists have been genetically modifying food crops since the mid 1990's. As a result, scientists have been able to produce cr

FromTheMoon [43]

C) Crops may cause an increase of allergic reactions in humans.

6 0

3 years ago

Read 2 more answers