Ques and Ans: What may vary in size as well as shape, but all are very small?
Options:
- (A) keeping food fresh for long periods of time
- (B) disease-causing microorganisms
- (C) A solid geometric shape
- (D) Unequal radiation absorption
- (E) Small countries.
- (F) Shapewear.
- (G) A water well.
- (H) Basic units of the plant body.
(H)
Explanation for the Ans above: [[Cells vary in size as well as shape, but all cells are very small. Basic unit of the plant body is the cell. Basic units of the plant body vary in size as well as shape, but all are very small.]]

Ques and Ans: Which is immobile?
Options:
- (A) adult starfish
- (B) all matter
- (C) adult goldfish
- (D) gastropod shells
- (E) tadpoles
- (F) adult sponges
- (G) an object
- (H) an organism's body
(F)
Explanation for the Ans above: [[Adult sponges are sessile. Sessile Attached permanently, immobile. Adult sponges are immobile.]]

Ques and Ans: When many muscles contract a little bit, simultaenous, it produces:
Options:
- (A) forces
- (B) heat
- (C) cold blooded
- (D) sweat
- (E) electrical energy
- (F) Energy
- (G) pain
- (H) thermal displacement
(B)
Explanation for the Ans above:
[[Shivering occurs when many muscles contract a little bit all at once. Heat production is increased by shivering and non-shivering thermogenesis . Heat production is increased when many muscles contract a little bit, all at once.]]