Question

these 5 practice questions

-. What is thought to have been one major factor in causing the Permian Mass Extin A. India pushing into Asia. B. Laurasia breaking apart C. Volcanism and Pangaea formation D. Gondwanaland land breaking apart E. Comet/asteroid impact

Answer 1

1. Though many theories exist, the most widely accepted reason is C) volcanism and Pangaea formation.

The increase in temperature and oxygen deficiency are considered as the major factors for mass extinction.

2. Hox gene clustures help lay out basic body forms of most animals from humans to earthworms. They are responsible for head to tail organisation in animals.

So the answer is A) Number and sequence of body structures in animals.

3. A) Homeotic gene.

4. A) and C). That is nervous and muscle tissue is unique to animals.

5. E) Diploblastic.