True or false: during embryonic development, the vertebral column is replaced by the notochord

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.

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Which organelle plays a role in intracellular digestion?