Q: What do you call different organs working together? Choices: - cellular system - endocrine system - maturation systems - organ systems A:
organ systems

Q: What is the layer above the troposphere? Choices: - thermosphere - mesosphere - troposphere - stratosphere A:
stratosphere

Q: Q: Lacking blood vessels, nerve endings, or glands, the epidermis is the outer layer of what? Choices: - liver - brain - lungs - skin A:
A: skin

Question: Q: Fossil records show that what process may occur in "fits and starts"? Choices: - generation - isolation - variation - evolution A:
Answer: evolution

*Question*
Q: What are the specialized cells of sponges called? Choices: - plant cells - helper cells - t cells - collar cells A:
**Answer**
collar cells

(Q).
Q: In prokaryotes, what are the regions called that repressors bind to? Choices: - elements - enablers - consumers - operators A:
(A).
operators