In sedimentary rock from over 2.7 million years ago, the presence of cellular membrane components indicate that at least unicellular life was present in abundance at that time. what biomolecular structure would indicate the presence of a cell enclosed in a membrane in the fossilized rock? a) dna and rna b) lipids and cholesterols c) proteins and nucleic acids d) chloroplasts and mitochondria

Which process must a cell undergo top identical cells at the end of cell division

Charles darwin published his theory of evolution in 1859. in what way foes modern evolutionary theory differ from the theory as proposed by darwin? a) darwin inferred that individuals can evolve, but modern generic science has shown that this is not true. b)darwin inferred that individuals do not evolve, but modern genetic science has shown that this is not true. c)modern science has disproved most of darwin's original theory of evolution, because darwin knew nothing about generations and their role in heredity. d)generic studies have shown that gene expression and other factors operate along with natural selection, but most of darwin's theory has been supported by modern science.

How are primary producers important to the alligator's energy supply