The red algae contain an accessory pigment called

a. xanthophyll.
b. phycobilin.
c. fucoxanthin.
d. laminarin.

Which of the following would most likely be key to gathering evidence that the rna world hypothesis is valid? creation of suitable environments for long-term study of single-celled organisms simulation of early earth conditions and long-term study of the resulting molecules development of a system for studying the microsphere's ability to absorb additional molecules categorization of the different specific conditions that result in the development of microspheres

Ecosystems involve living organisms interacting with non-living things in a productive way; how is photosynthesis an example of this? answer, i will give brainiest to first person to get it right.

If a young male's body is just beginning the process of producing sperm, when is it likely that he would ejaculate mature, viable sperm"