Q: Humans have an estimated 20,000 to 22,000 of what units of heredity? Choices: - eggs - cells - chromosomes - genes A:
genes

(Question)
Q: The coccyx, or tailbone, results from the fusion of four small what? Choices: - rib vertebrae - arsine vertebrae - alangulam vertebrae - coccygeal vertebrae A:
(Answer)
coccygeal vertebrae

Ques: Q: Vascular tissue allowed these plants to do what? Choices: - grow smaller - have more flowers - live shorter - grow taller A:
Ans: grow taller

(Q).
Q: What is the name of a joint in which one bone rotates in relation to another bone? Choices: - gliding - hinge - ball and socket - pivot joint A:
(A).
pivot joint

Ques:Q: What is the method of evolution by which advantageous heritable traits become more common over generations? Choices: - artificial selection - same selection - flow selection - natural selection A:

Ans:natural selection

Ques:Q: Conotoxins released by certain marine snails can bring about paralysis in humans, indicating that this toxin attacks what system? Choices: - cerebral - circulatory - cardiovascular - neurological A:

Ans:
neurological