question: How can an animal learn actions?
Options:
- (A) movement
- (B) Chemical energy
- (C) by fighting
- (D) through play
- (E) by eating
- (F) when they sleep
- (G) stamina
- (H) Riding a bike
answer: Behaviors can be learned through play. Kids imitate adult actions and behaviors. Actions can be learned through play.
The answer is (D)

question: What creates active immunity from a parasite?
Options:
- (A) Cooking
- (B) memory cells
- (C) alpacas
- (D) peachleaf willow
- (E) Allergies
- (F) mammals
- (G) an organism's body
- (H) animals
answer: Active immunity results when an immune response to a pathogen produces memory cells. If the parasite causes harm, it is a pathogen. When a parasite produces memory cells, active immunity results.
The answer is (B)

question: Organisms in a marine biome must be be adapted to what in the water?
Options:
- (A) mud
- (B) Nutrients
- (C) sodium
- (D) toxins
- (E) motion
- (F) sugar
- (G) energy
- (H) an anion
answer: Organisms that live in marine biomes must be adapted to the salt in the water. Another name for salt is sodium. Organisms that live in marine biomes must be adapted to the sodium in the water.
The answer is (C)

question: Dna is found where in a cell?
Options:
- (A) mitochondria
- (B) complex
- (C) alveoli
- (D) membrane
- (E) plants
- (F) infected
- (G) cytoplasm
- (H) nucleus
answer:
DNA is found in chromosomes. Chromosomes are located in the nucleus of a cell. DNA is found in the nucleus of a cell.
The answer is (H)