q: What animals belong to the largest phylum of invertibrates?
Options:
- (A) plants
- (B) parasites
- (C) octopuses
- (D) tortoises
- (E) eartworms
- (F) insects
- (G) mammals
- (H) animals
a: (F)... Explanation: Arthropods are the largest phylum of invertebrates. Insects are the largest group of arthropods. Insects belong to the largest phylum of invertibrates. That's why the answer is (F).

q: _ are an essential nutrient for animals.
Options:
- (A) Energy
- (B) Chemicals
- (C) trees
- (D) potatoes
- (E) Acids
- (F) allow growth
- (G) store
- (H) Proteins
a: (H)... Explanation: All animals are heterotrophs. Proteins are an essential nutrient for heterotrophs . Proteins are an essential nutrient for animals. That's why the answer is (H).

q: Plants live just about everywhere within our planet's what?
Options:
- (A) crust
- (B) solar system
- (C) state
- (D) the environment
- (E) atmosphere
- (F) moon
- (G) solar energy
- (H) vegetation
a: (E)... Explanation: Plants live just about everywhere on Earth. Air is everywhere in the earth's atmosphere. Plants live just about everywhere within the atmosphere. That's why the answer is (E).

q: 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
a:
(G)... Explanation: Adult sponges are sessile. Sessile Attached permanently, immobile. Adult sponges are attached permanently and cannot move. That's why the answer is (G).