Fact 1: Freshwater biomes have water that contains little or no salt. Fact 2: Freshwater biomes have suffered mainly from pollution. Given the two facts above, biomes that have suffered mainly from pollution have water that contains little or no what?

OPTIONS:
- Toxins
- CO 2
- liquid
- salt
- Lead
- Carbon
- Acids
- sulfur

Answer: salt

Fact 1: Sound can be used for communication by animals. Fact 2: Animals use sound in sophisticated ways. Given the two facts above, animal what is sophisticated?

OPTIONS:
- exoskeleton
- four limbs
- communication
- nervous system
- hormones
- in the frog family
- proteins
- circulatory systems

Answer: communication

Fact 1: Fertilization occurs when a sperm and an egg fuse to form a diploid zygote. Fact 2: Sperm and eggs are cells known as gametes. Given the two facts above, what occurs when gametes fuse to form a diploid zygote?

OPTIONS:
- permineralization
- rapid expansion
- competition
- fertilization
- photosynthesis
- chromosomes
- mutation
- Leptospirosis

Answer: fertilization

Fact 1: Some viruses have an envelope of phospholipids and proteins. Fact 2: Enveloped viruses make their own membranes. Given the two facts above, some what make their own membranes?

OPTIONS:
- fungi
- insects
- viruses
- mammals
- fur seals
- humans
- animals
- sharks

Answer:
viruses