q: Some producers use what physical feature to use energy and inorganic molecules?
Options:
- (A) leaves
- (B) sunlight
- (C) solar energy
- (D) sun
- (E) resevoir
- (F) chemicals
- (G) mitosis
- (H) trees
a: (A)... Explanation: Producers use energy and inorganic molecules to make food. Leaves make food for the plant. Some producers have leaves to help use energy and inorganic molecules. That's why the answer is (A).

q: What is one of the ways that mammals and other animals learn how to act?
Options:
- (A) sleeping
- (B) Movement
- (C) mating
- (D) exercise
- (E) eating
- (F) sound
- (G) playing
- (H) motion
a: (G)... Explanation: Playing is just one of many ways that mammals and other animals learn how to behave. Acting is about behaving. Playing is just one of many ways that mammals and other animals learn how to act. That's why the answer is (G).

q: Hummingbirds are what they are today as a necessary consequence of their relationship to what?
Options:
- (A) a feeder
- (B) humans
- (C) bees
- (D) survival
- (E) animals
- (F) Plants
- (G) Earth
- (H) weeds
a: (F)... Explanation: Some birds are pollinators that co-evolved with plants. Hummingbirds are the most common bird pollinators. Hummingbirds co-evolved with plants. That's why the answer is (F).

q: Language can be learned through
Options:
- (A) play
- (B) osmosis
- (C) instincts
- (D) years
- (E) Birds
- (F) a path
- (G) sent
- (H) nerves
a:
(A)... Explanation: Behaviors can be learned through play. Language is a learned human behavior. Language can be learned through play. That's why the answer is (A).