Q: What do scientists use to help explain objects or systems in simpler ways? Choices: - theories - measurements - plants - models A:
models

(Question)
Q: What do you call the type of molecular signals that include insulin and that help regulate a number of biochemical processes? Choices: - nerves - acids - enzymes - hormones A:
(Answer)
hormones

Ques: Q: What is defined as a repeating series of events that include growth, dna synthesis, and cell division? Choices: - photosynthesis - meiosis - puberty - cell cycle A:
Ans: cell cycle

(Q).
Q: What compound has positive and negative ions? Choices: - hydrocarbon - protein - covalent - ionic A:
(A).
ionic

Ques:Q: Aging is associated with the death of what? Choices: - proteins - genes - muscles - cells A:

Ans:cells

Q: What kind of mammalian reproduction is risky for the offspring but not the mother? Choices: - asexual - sexual - cactaceae - monotreme A:
monotreme