Q: What class of animals have four limbs and produce amniotic eggs? Choices: - reptiles - insects - amphibians - mammals A:
mammals

Q: What substances are secreted by specialized cells usually located in endocrine glands? Choices: - lipids - protein - acid - hormones A:
hormones

Q: What are resources that don't run out? Choices: - residual resources - general resources - orbital resources - renewable resources A:
renewable resources