Ques:[The molecules secreted by activated b cells are part of the:
Options:
- (A) immune system
- (B) Organic compounds
- (C) Energy.
- (D) an organism's body
- (E) acetic acid
- (F) harmful substances
- (G) Chemical energy
- (H) Veins and arteries.]
Ans:[Plasma cells are activated B cells that secrete antibodies. Antibodies are manufactured by the immune system. Plasma cells are activated B cells that secrete immune system molecules.
(A)]

Ques:[Most of what type of animal is known for having a shell?
Options:
- (A) fossils
- (B) toads
- (C) eggs
- (D) swea
- (E) small
- (F) insects
- (G) porous
- (H) snail]
Ans:[Most mollusks have shells. Among mollusks, the golden snail is a survivalist. Most snails have shells.
(H)]

Ques:[Most types of what have motility?
Options:
- (A) gastropod shells
- (B) members of their own species
- (C) single-celled organisms
- (D) Something to move
- (E) remains of prehistoric life
- (F) microbial fuel cells
- (G) microorganisms
- (H) share properties]
Ans:[Most protists have motility. Protists Protists are single-celled organisms. Most single-celled organisms have motility.
(C)]

Ques:[What do male dogs use in urine to mark their territory?
Options:
- (A) Natural aphrodisiacs
- (B) competing for resources
- (C) Tails
- (D) Urine cleaner
- (E) Something coming from a gland
- (F) Chemical energy
- (G) an area swollen with pus
- (H) Chew toys]
Ans:
[Male dogs use pheromones in urine to mark their territory. Pheromones are natural aphrodisiacs. Male dogs use natural aphrodisiacs in urine to mark their territory.
(A)]