What are a major food source to organisms including humans?
Options:
- (A) leeches
- (B) earthworms
- (C) snails
- (D) plants
- (E) tapeworms
- (F) trees
- (G) potatoes
- (H) bushes
--
Let's think first: Mollusks are a major food source for other organisms, including humans. Mollusks in the diorama include snails and clams. Snails are a major food source for other organisms, including humans.... So the answer is [(C)]
One example of an annelid has how many hearts?
Options:
- (A) three
- (B) Five
- (C) white
- (D) warm
- (E) four
- (F) strong
- (G) long
- (H) small
--
Let's think first: Annelids are worms such as the familiar earthworm. An earthworm has five hearts. An animal that has five hearts is an annelid.... So the answer is [(B)]
What kind of cell division produces sex cells in animals?
Options:
- (A) complex
- (B) insects
- (C) pollen
- (D) gametes
- (E) sexual division
- (F) meiosis
- (G) reproduction cells
- (H) seeds
--
Let's think first: Meiosis is the type of cell division that produces gametes. Animals that reproduce sexually produce sex cells, or gametes. Meiosis is the type of cell division that produces sex cells.... So the answer is [(F)]
How do platypus lay eggs?
Options:
- (A) epidermis and dermis
- (B) on a flat plane
- (C) in a tree
- (D) fur and fat
- (E) during the day
- (F) it keeps an organism warm
- (G) in a dug out area
- (H) in the water
--
Let's think first: Platypus females lay their eggs in a burrow. Burrows dug by badgers are also important in many areas. Platypus females lay eggs in a dug out area.... So the answer is [(G)]
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
--
Let's think first: 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.... So the answer is [(C)]
Some crustaceans feed on
Options:
- (A) phytoplankton
- (B) fungi
- (C) refraction of light
- (D) heat energy
- (E) an organism's body
- (F) carbon
- (G) algae
- (H) salt and water.
--

Let's think first: Zooplankton are tiny animals that feed on phytoplankton. Many zooplankton are crustaceans. Some crustaceans feed on phytoplankton.... So the answer is [(A)]