question... What are attached permanently?
Options:
- (A) Veins and arteries.
- (B) sensory neurons
- (C) barnacles
- (D) tadpoles
- (E) seahorses
- (F) alligators
- (G) adult sponges
- (H) an organism's body
answer... Adult sponges are sessile. Sessile Attached permanently, immobile. Adult sponges are attached permanently and cannot move.
The answer is (G)

question... Damaged dna might benefit from:
Options:
- (A) resistance
- (B) cellular repair
- (C) mutagens
- (D) UV rays
- (E) recovery
- (F) radiation
- (G) Electrical energy
- (H) flow of electrons
answer... Cells have multiple repair mechanisms to fix mutations in DNA. And if the damaged DNA is duplicated, it causes mutation. Cells have multiple repair mechanisms to fix damaged DNA.
The answer is (B)

question... The first tetrapods were
Options:
- (A) major threat to health
- (B) remains of prehistoric life
- (C) in the frog family
- (D) running and lifting
- (E) competing for resources
- (F) warm-blooded
- (G) objects that have mass
- (H) graptolites
answer...
Amphibians are the first true tetrapods, or vertebrates with four limbs. All frogs are amphibians. Animals in the frog family are the first true tetrapods.
The answer is (C)