Which of these describes transport that uses no energy but requires proteins?
a. passive transport
b. primary active transport
c. facilitated transport
d. secondary active transport

Which of the following is an abiotic factor in an ecosystem? a. bacteriab. airc. niched. grass(abiotic=non-living) me !

As the earth formed, the force of gravity increased due to increased mass. what effect did this increased gravity have on the forming planet?

Prokaryotic and eukaryotic cells are different in many ways other than the presence or absence of a nucleus. if both archaebacteria and eubacteria are prokaryotic cells, then why are archaebacteria more closely related to eukaryotic cells than they are to eubacteria?