question: What can happen to a population when animals begin to migrate?
Options:
- (A) It expands
- (B) harm them
- (C) it can change species
- (D) Move to another area
- (E) it can eat more
- (F) it can go extinct
- (G) it can fluctuate
- (H) Plant growth is reduced
answer: Migration is a type of movement that changes population size. Population viability Population sizes are under constant fluctuation. Migration is a type of movement that causes a population to fluctuate.
The answer is (G)

question: What can liquid waste be?
Options:
- (A) gas
- (B) Gaseous
- (C) Solid
- (D) Acidic
- (E) acid rain
- (F) expelled
- (G) Static
- (H) dangerous
answer: Urine is the liquid waste product of the body that is excreted by the urinary system. Acid urine is usually darker thatn alkaline urine. Liquid waste can be acidic.
The answer is (D)

question: What release oxygen during the day but not at night?
Options:
- (A) sea anenomes
- (B) Organic compounds
- (C) orange trees
- (D) coral
- (E) power stations
- (F) humans
- (G) swamp vegetation
- (H) important habitats
answer: Plants release oxygen during the day but not during the night. All orange trees are plants. Orange trees release oxygen during the day but not at night.
The answer is (C)

question: 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.
answer:

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
Mutations may change the structure of a chromosome or just change a single nucleotide. DNA is made up of nucleotides. Mutations change DNA.
The answer is (H)