q: What provides food and shelter to many ocean organisms?
Options:
- (A) It helps them survive
- (B) Something formed from skeleton
- (C) sedimentary rocks
- (D) important habitats
- (E) Something with a head, thorax, and abdomen
- (F) it protects them
- (G) gastropod shells
- (H) in their habitats
a: (B)... Explanation: Coral reefs provide food and shelter to many ocean organisms. Coral reefs are formed from coral skeletons. Something formed from skeletons provide food and shelter to many ocean organisms. That's why the answer is (B).

q: What is less complex in smaller, simple cells?
Options:
- (A) sensory neurons
- (B) Cell death
- (C) peachleaf willow
- (D) Cell division
- (E) Sex
- (F) permineralization
- (G) Veins and arteries.
- (H) Pregnancy
a: (D)... Explanation: Cell division is more complex in eukaryotes than prokaryotes. Prokaryotes are smaller and simpler than eukaryotes. Cell division is less complex in smaller, simple cells. That's why the answer is (D).

q: What is the process of breaking down food proteins into energy or heat?
Options:
- (A) dissecting
- (B) dehydration
- (C) elimination
- (D) energy
- (E) digestion
- (F) Cooking
- (G) calorie retention
- (H) Evaporation
a: (E)... Explanation: Digestion is the process of breaking down food into components the body can absorb. Food proteins are changed into energy or heat to be used or absorbed by the body. Digestion is the process of breaking down food proteins into energy or heat. That's why the answer is (E).

q: What do migrants usually do?
Options:
- (A) move to different locations
- (B) animal transport
- (C) they will move to another area
- (D) spread flower seeds
- (E) dwell in a city
- (F) travel to a far away place
- (G) become their country president
- (H) dwell on a farm
a:
(F)... Explanation: Migrants typically travel long distances. Distance Finder Find the distance between two places. Migrants usually travel between two places fa away from each other. That's why the answer is (F).