Ques and Ans: How do organisms give rise to children?
Options:
- (A) mitosis
- (B) reproduction
- (C) reproductive isolation
- (D) Plants growth
- (E) it needs them
- (F) litter
- (G) by indirect light
- (H) replenishing
(B)
Logic for the answer: Reproduction is the process by which organisms give rise to offspring. Seed refers to offspring, children. Organisms give rise to children by reproduction.

Ques and Ans: What tells a cell what to do?
Options:
- (A) breathe
- (B) alleles
- (C) Energy
- (D) voltage
- (E) fever
- (F) genes
- (G) nerves
- (H) state
(F)
Logic for the answer: Molecules of DNA are encoded with instructions that tell cells what to do. Genes are parts of DNA molecules. Genes are instructions that tell cells what to do.

Ques and Ans: What has a centralized nervous system with a brain?
Options:
- (A) Man
- (B) Birds
- (C) leeches
- (D) shark
- (E) evergreens
- (F) salmon
- (G) worms
- (H) pan
(D)
Logic for the answer: Fish have a centralized nervous system with a brain. Sharks are a type of fish. Sharks have a centralized nervous system with a brain.

Ques and Ans: Rivers easily dissolve nutrients and:
Options:
- (A) bacteria
- (B) chemicals
- (C) oxygen
- (D) sodium
- (E) vitamin C
- (F) glucose
- (G) a solute
- (H) a hazard
(C)
Logic for the answer:
Running water is better able to dissolve oxygen and nutrients than standing water. Large, warm rivers hold populations but few occur in cold running water. Oxygen and nutrients dissolve easily in rivers.