Every amino acid has four characteristic components. list the four parts of an amino acid

*will mark brainliest to first correct answer* photosynthesis led to increasing levels during the later proterozoic eon? a. oxygen b. water c. carbon dioxide d. none of the above

Identify the examples in which sam interacts only with natural resources

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots