q: In order to attract flies, wasps, and bees, what does a flower employ?
Options:
- (A) petals
- (B) colors
- (C) insects
- (D) camouflage
- (E) Energy
- (F) scentless
- (G) lack of color
- (H) pollen
a: (A)... Explanation: Petals attract pollinators to the flower. Pollination is by flies, wasps, and bees. Petals attract flies, wasps, and bees to the flower. That's why the answer is (A).

q: What are chromosomes made of?
Options:
- (A) Deoxyribonucleicacid, protein
- (B) sulfuric acid, fat
- (C) Chemical energy
- (D) protein, hydrobromic acid
- (E) boric acid, protein
- (F) Something that comes in a bundle of fibers
- (G) sub-units of species
- (H) A compound that donates proton
a: (A)... Explanation: Chromosomes are coiled structures made of DNA and proteins. DNA stands for Deoxyribonucleicacid. Chromosomes are coiled structures made of Deoxyribonucleicacid and proteins. That's why the answer is (A).

q: Cancer and tumors are a result of specific types of:
Options:
- (A) organs
- (B) cigarettes
- (C) radiation
- (D) layers of fat
- (E) gene damage
- (F) rays or beams
- (G) Chemical energy
- (H) the skin
a: (E)... Explanation: Cancer is a disease in which cells divide out of control. With specific types of gene damage, the cell starts dividing out of control, forming a tumor. Cancer and tumors are a result of specific types of gene damage. That's why the answer is (E).

q: What systems are pollutants bad for?
Options:
- (A) destroying life
- (B) classification system
- (C) an organism's body
- (D) respiratory and circulatory
- (E) animal habitats
- (F) ambulatory systems
- (G) social security system
- (H) the environment
a:

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
(D)... Explanation: Air pollution harms the respiratory and circulatory systems. Air pollution is caused by lots of different pollutants. Several different pollutants harm the respiratory and circulatory systems. That's why the answer is (D).