Aplant's response to an external stimulus involves receptors. a receptor that responds to light normally contains

What evidence supports the law of conservation of energy? a) mechanical energy is converted to chemical energy during photosynthesis. b) oxygen is made from the breakdown of carbon dioxide during photosynthesis. c)energy is absorbed by chlorophyll and becomes chemical energy during photosynthesis. d)the sun gives off light energy that is absorbed by plants.

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million

What kinds of molecules can pass through the cell membrane without any problem?