15. A zebra mussel is discovered in a lake in Pennsylvania for the first time. Why
would this make an ecologist worried?
O A. Zebra mussels need to live in salt-water environments and it will hurt the
organism.
O B. Zebra mussels are vulnerable to many predators in that lake.
O C. Zebra mussels are an invasive species that can completely disrupt an
ecosystem.
O D . Zebra mussels need to live in hot-water environments.

Match each organ or function with its body system. produces urine large intestine ureters mouth filters blood absorbs nutrients from food

Study the diagram of a desert food chain . what would most likely happen if the kangaroo rats were killed off and removed from the food chain ?

Darrel conducted an experiment with the following procedure: fill two cups with ice water. place an uninflated balloon snuggly onto your left index finger. blow a little air into an identical balloon, and place it onto your right index finger. place both fingers into the cups of ice water. darrel noticed that his right finger felt warmer in the ice water than did his left finger. which of the following does the experiment show? a. air is a good radiator of heat. b. air is a good insulator of heat. c. air is a good conductor of heat. d. air is a good convector of heat.