Which are characteristics of mammals? Check all that apply. internal fertilization
three-chambered heart
I endothermic
highly developed nervous system
several nearly hollow bones
I always live on land

Where can you find prokaryotic and eukaryotic cells?

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.

Where in the cell are ribosomes made?