Heterotrophs conduct cellular respiration and use what 2 things? * 1. Water and Carbon dioxide
2. hydrogen and oxgyen
3. chemical and physical

Please answer

Proteins are made from amino acids. an amino acid has three parts that are joined to a central carbon atom. identify the three parts that create an amino acid.

Which is the graph of the piecewise function f(x)? f(x) = image for option 1 image for option 2 image for option 3 image for option 4

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm