How do some insects communicate?
Options:
- (A) sound
- (B) sensory neurons
- (C) Decibels
- (D) electronic waves
- (E) progesterone
- (F) Vibrates
- (G) pheromones
- (H) radio waves
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Let's think first: Ants communicate with chemicals called pheromones. Ants are of extreme importance in the insect world. Some insects communicate with chemicals called pheromones.... So the answer is [(G)]

Which part of fungi have humans collected and grown for food for thousands of years?
Options:
- (A) more abundant
- (B) by indirect light
- (C) remains of prehistoric life
- (D) it keeps an organism warm
- (E) epidermis and dermis
- (F) Organic compounds
- (G) loose soil
- (H) fruiting structure
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Let's think first: Humans have collected and grown mushrooms for food for thousands of years. About mushrooms Mushrooms are the fruiting structure of fungi. Humans have collected and grown the fruiting structure of fungi for food for thousands of years.... So the answer is [(H)]

Crustaceans and insects have what special structures?
Options:
- (A) the eyes
- (B) a cuticle
- (C) internal
- (D) excretory
- (E) invisible
- (F) Chlorophyll
- (G) fur and fat
- (H) muscled
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Let's think first: Some arthropods have special excretory structures. Crustaceans are, like insects, arthropods. Crustaceans and insects have special excretory structures.... So the answer is [(D)]

What is essential for evolution to occur?
Options:
- (A) Changes in DNA sequences
- (B) Plant reproduction
- (C) Natural disasters
- (D) Gamma radiation
- (E) biological diversity
- (F) DNA sequences staying the same
- (G) the environment
- (H) that material's properties
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Let's think first: Mutations are essential for evolution to occur. Mutations are changes in the DNA sequence. Changes in DNA sequences are essential for evolution to occur.... So the answer is [(A)]

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
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Let's think first: Migrants typically travel long distances. Distance Finder Find the distance between two places. Migrants usually travel between two places fa away from each other.... So the answer is [(F)]

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)]