Some investigators concluded that the first organisms consisted of rna rather than dna. what is importance of this "rna world" period?

Biomass can be used to generate electricity. biomass relies heavily on agricultural crops. plants release carbon dioxide and water in combustion. plants use photosynthesis to originally generate the energy that is needed. the chemical energy of these plants all started with what energy source?

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this

Which of the following statements is true of cells