Ques and Ans: What phylum do starfish belong to?
Options:
- (A) fertile
- (B) animals
- (C) Echinoderm.
- (D) Mollusca.
- (E) Sponge.
- (F) Absorb light
- (G) Annelid.
- (H) a fish
(C)
Logic chain: Echinoderms have a unique water vascular system with tube feet. Each starfish arm is lined with tube feet. Starfish are echinoderms.

Ques and Ans: What animal found on earth would belong to the phylum platyhelmintes?
Options:
- (A) bilaterally symmetrical worms
- (B) Something with a head, thorax, and abdomen
- (C) remains of prehistoric life
- (D) Something that makes plants green
- (E) Microscopic organisms
- (F) female sex cells
- (G) it helps plants in growing
- (H) share properties
(A)
Logic chain: Flatworms belong to the phylum Platyhelminthes. Flatworms are bilaterally symmetric. Bilaterally symmetric worms belong to the phylum Platyhelminthes.

Ques and Ans: Thyroxine increases the rate of metabolism in cells throughout the what?
Options:
- (A) Summer
- (B) body
- (C) state
- (D) skin
- (E) H 2 O
- (F) HIV
- (G) life
- (H) humans
(B)
Logic chain: Thyroid hormones increase the rate of metabolism in cells throughout the body. Thyroxine, a thyroid hormone, is an aryl iodide. Thyroxine increases the rate of metabolism in cells throughout the body.

Ques and Ans: What is essential for cellular respiration for all aerobic organisms.
Options:
- (A) electron
- (B) glucose
- (C) Energy
- (D) Energy.
- (E) chemicals
- (F) Plants
- (G) fungi
- (H) bacteria
(F)
Logic chain:
Oxygen is essential for cellular respiration for all aerobic organisms. Oxygen, for example, is produced by plants. Plants are essential for cellular respiration for all aerobic organisms.