Ques and Ans: What has a nervous system?
Options:
- (A) Nerve tonic
- (B) Jellyfish
- (C) Air
- (D) fur seals
- (E) Cardiovascular system
- (F) animals
- (G) chickens
- (H) elephants
(B)
Explanation for the Ans above: [[Most invertebrates have a nervous system. Jellyfish and insects are invertebrates. Jellyfish have a nervous system.]]

Ques and Ans: What do mutations do to dna?
Options:
- (A) It expands
- (B) Damages them
- (C) negative
- (D) Moisturize it.
- (E) Help it.
- (F) Destroy it.
- (G) It decreases
- (H) Change it.
(H)
Explanation for the Ans above: [[Mutations may change the structure of a chromosome or just change a single nucleotide. DNA is made up of nucleotides. Mutations change DNA.]]

Ques and Ans: What is a process of removing wastes and excess water from the body?
Options:
- (A) hydration
- (B) urination
- (C) incontinence
- (D) trash can
- (E) vaporization
- (F) Cooking
- (G) body waste
- (H) Exfoliation
(B)
Explanation for the Ans above:
[[Excretion is the process of removing wastes and excess water from the body. Ketones are exhaled and excreted in urine. Urination is a process of removing wastes and excess water from the body.]]