(question). What kind of animal doesn't have a centralized nervous system?
Options:
- (A) dog
- (B) mammals
- (C) cows
- (D) bird
- (E) human
- (F) elephants
- (G) starfish
- (H) a fish
(answer). Echinoderms lack a centralized nervous system. Echinoderms are represented by the starfish. Starfish lack a centralized nervous system.
The answer is (G)


(question). What is caused by a lack of a hormone that helps cells absorb sugar from the blood?
Options:
- (A) glucose
- (B) cancer
- (C) resistance
- (D) diabetes
- (E) fever
- (F) serotonin
- (G) epilepsy
- (H) Dehydration
(answer). Insulin is a hormone that helps cells absorb sugar from the blood. Diabetes is caused by a lack of insulin. Diabetes is caused by a lack of hormone that helps cells absorb sugar from the blood.
The answer is (D)


(question). An animal which may have one or two hearts to pump blood is:
Options:
- (A) squid
- (B) goats
- (C) bats
- (D) mammals
- (E) toads
- (F) Birds
- (G) edible
- (H) a fish
(answer). Mollusks have a circulatory system with one or two hearts that pump blood. Interestingly, a squid is also a mollusk. Squid have a circulatory system with one or two hearts that pump blood.
The answer is (A)


(question). What can have motility?
Options:
- (A) Small things with a microscope
- (B) gastropod shells
- (C) members of their own species
- (D) one celled organisms
- (E) Something to move
- (F) mitochondria
- (G) rocks
- (H) intestines
(answer).

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
Most protists have motility. Protists are one celled organisms. One celled organisms can have motility.
The answer is (D)