What do male dogs use in urine to mark their territory?
Options:
- (A) Natural aphrodisiacs
- (B) competing for resources
- (C) Tails
- (D) Urine cleaner
- (E) Something coming from a gland
- (F) Chemical energy
- (G) an area swollen with pus
- (H) Chew toys
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Let's think first: Male dogs use pheromones in urine to mark their territory. Pheromones are natural aphrodisiacs. Male dogs use natural aphrodisiacs in urine to mark their territory.... So the answer is [(A)]

What can some insects use their feelers to detect?
Options:
- (A) kale
- (B) noise
- (C) water vapor
- (D) tremors
- (E) waves
- (F) vibrate
- (G) air
- (H) sound
--
Let's think first: Some insects can use their antennae to detect sound. An insect's head has two feelers, or antennae. Some insects can use their feelers to detect sound.... So the answer is [(H)]

What can better dissolve nutrients and oxygen?
Options:
- (A) lakes
- (B) SO2
- (C) Raft
- (D) a solute
- (E) puddles
- (F) rivers
- (G) currents
- (H) lochs
--
Let's think first: Running water is better able to dissolve oxygen and nutrients than standing water. Large, warm rivers hold populations but few occur in cold running water. Rivers can better dissolve oxygen and nutrients than lakes.... So the answer is [(F)]

Vesicle transport is a form of _.
Options:
- (A) diffusion
- (B) animals
- (C) communication
- (D) movement
- (E) direct energy
- (F) resistance
- (G) Vibrations.
- (H) motion
--
Let's think first: Vesicle transport requires energy, so it is also a form of active transport. Active transport is another form of diffusion. Vesicle transport is a form of diffusion.... So the answer is [(A)]

What might fall on land may soak into the ground, becoming groundwater?
Options:
- (A) river
- (B) floods
- (C) Rocks
- (D) Hail
- (E) rain
- (F) Soil
- (G) Trash
- (H) salt
--
Let's think first: Some precipitation that falls on land may soak into the ground, becoming groundwater. Hail, rain, sleet, and snow are referred to as precipitation . Hail that falls on land may soak into the ground, becoming groundwater.... So the answer is [(D)]

Female gametophytes produce eggs inside the part of the flower where what will eventually develop?
Options:
- (A) embryos
- (B) bushes
- (C) seeds
- (D) fruit
- (E) honey
- (F) fertile
- (G) pollen
- (H) bamboo
--
Let's think first: Female gametophytes produce eggs inside the ovaries of flowers. Fruits develop from the ovary of the flower. Female gametophytes produce eggs inside the part of the flower where the fruit will eventually develop.... So the answer is [(D)]