Of the following, identity the system you would find in a human, but not in a flatworm.

a nervous system
a digestive system
a respiratory system

Iguanas need to live in a habitat that is very warm, so the pet store warms their enclosures with "basking lights" which act as an artificial sun. describe how the three methods of thermal energy transfer may take place within the iguana's enclosure.

Did you know that a single bee would have to go to over 2 million flowers to make a single pound of honey?

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion