An organ is a? #1. Group of organs that work together.
#2. Group of similar cells that perform a particular function.
#3. Cell that has a specific function inside the body.

Which sentence best expresses the differing opinions of these two book reviews?

The body is protected against harmful flu viruses by

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures