Ques:[What contains deoxyribonucleic acid but not much else.
Options:
- (A) minerals
- (B) bacteria
- (C) loose soil
- (D) pollen
- (E) viruses
- (F) anemia
- (G) PDAs
- (H) vertebrates]
Ans:[Viruses contain DNA but not much else. DNA is an abbreviation for deoxyribonucleic acid. Viruses contain deoxyribonucleic acid but not much else.
(E)]

Ques:[How is survival ensured around hydrothermal vents?
Options:
- (A) heat produced
- (B) Eating a lot
- (C) Reproducing quickly
- (D) biological diversity
- (E) vegetation
- (F) Being in a cluster
- (G) Staying far apart
- (H) hydrate their cells]
Ans:[Organisms cluster around hydrothermal vents in the ocean floor. To survive, some organisms living near hydrothermal vents have formed close associations. Clusters form around hydrothermal vents to ensure survival.
(F)]

Ques:[When an animal or plant group gets much smaller, that's called a:
Options:
- (A) bottleneck
- (B) Winter
- (C) Movement
- (D) population explosion
- (E) genus
- (F) relocation
- (G) Mason jar effect
- (H) choker]
Ans:[Bottleneck effect occurs when a population suddenly gets much smaller. Animals and plants exist as populations. Bottleneck effect occurs when an animal or plant group gets much smaller.
(A)]

Ques:[What is an example of an echinoderm?
Options:
- (A) a fish
- (B) eel
- (C) starfish
- (D) parasites
- (E) ferns
- (F) shark
- (G) fertile
- (H) algae]
Ans:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
[Echinoderms have a unique water vascular system with tube feet. Each starfish arm is lined with tube feet. Starfish are an echinoderm with a unique water vascular system.
(C)]