19. which factor within a population could be studied to determine whether the population is evolving?

Modern sea star larvae resemble some primitive vertebrate larvae. this similarity may suggest that primitive vertebrates

Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. crinoids were most abundant in pennsylvania during the mississippian period, which ranged from 375 to 320 million years ago. fossils of the crinoids shows that during most of this time pennsylvania was that provided favorable conditions for crinoid growth. a) glacial terrain b) a dry and sandy plain c) mostly mountain ranges d) covered by warm, shallow seas

An organism lives in a container with very little oxygen. it produces ethanol and carbon dioxide as waste products. which process does it use to produce most of its atp molecules? a. lactic acid fermentation b. glycolysis c. electron transport chains d. alcohol fermentation