[[Ques]]: Dilation occurs when part of a cell that a what does not have relaxes.
Options:
- (A) breathing
- (B) organ
- (C) the eyes
- (D) abrasion
- (E) complex
- (F) animal
- (G) nerves
- (H) retina
[[Ans]]: [Dilation occurs when cell walls relax. Animals have no cell walls. Dilation occurs when part of a cell that an animal does not have relaxes.]
[(F)]

[[Ques]]: What involves a sperm and egg fusing to form a diploid zygote?
Options:
- (A) Leptospirosis
- (B) produce offspring
- (C) allow growth
- (D) sexual reproduction
- (E) metabolic reaction
- (F) peachleaf willow
- (G) rapid expansion
- (H) Plant reproduction
[[Ans]]: [Fertilization occurs when a sperm and an egg fuse to form a diploid zygote. Sexual reproduction requires formation of gametes, followed by fertilization. Sexual reproduction involves a sperm and egg fusing to form a diploid zygote.]
[(D)]

[[Ques]]: Most ecosystems get energy from what in the atmosphere?
Options:
- (A) fires
- (B) Sun
- (C) wind
- (D) summer
- (E) oxygen
- (F) Light
- (G) heat
- (H) H20
[[Ans]]:
[Most ecosystems get energy from sunlight. On Earth, energy from sunlight heats the atmosphere more at the equator than at the poles. Most ecosystems get energy from heat in the atmosphere.]
[(G)]