Q: What is produced by leydig cells in the embryonic testis and stimulates the development of male sexual organs? Choices: - androgen - insulin - estrogen - testosterone A:
testosterone

Q: What do monotremes lack though they have hair and produce milk? Choices: - nerves - skin - tail - nipples A:
nipples

Q: Q: A diploid zygote is formed when one sperm does what? Choices: - cracks the egg - repels the egg - incapacitates the egg - fertilizes the egg A:
A: fertilizes the egg

Question: Q: Rust consists of oxides of what element? Choices: - Copper - Gold - Aluminum - iron A:
Answer: iron

*Question*
Q: What does phagocytosis defend the body from? Choices: - allergies - obesity - parasites - pathogens A:
**Answer**
pathogens

(Question)
Q: Reptiles can be found on every continent except which one? Choices: - south america - africa - australia - antarctica A:
(Answer)
antarctica