What are the similarities between homozygus and heterozygus

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above

These are the components of the reservoirs of carbon that are exchanged in our environment.

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?