Ectotherm - this is an organism that depends on external sources to maintain body heat. Here is a frog that lives on the wall of my pool!

Endotherm - this is an organism that maintains it's own body heat. Here are the two hottest, and coolest guys you will ever have the price ledge of being acquainted to. They are endothermic.

Ethylene - this is a hormone is fruits that controls ripening! Here is an apple!

Gibberellins - these are plant hormones that control stem growth, flowering, and germination. My coleus contains gibberellins.

Pollen is the fine, powdery substance, which contains a gamete, from the male part of the plant in order to reproduce. These trees produce pollen in the spring time.