The correct option is A. Cooler, more dense material sink while warmer, less dense material rises.
Explanation:
Convection can simply be described as the transfer of heat energy among molecules or substances. Convection will occur if molecules of liquid or gas are given rough supply of heat. Hot liquids or gases would have the following properties:
Their density would be less.
They would have the ability to rise.
Whereas the cooler molecules will have the following properties:
Their density would be more than the hot molecules.
Organisms are part of an environment and are continually adapting to the changes to live. These environmental changes and the adaptation play a major role in evolution of organism.
Both the Euglena and Volvox use an oral groove to obtain food, Brigid Ha. B. Both the euglena and volvox use chloroplasts to obtain food through photosynthesis.