Anatomical structures, including homologous, analogous, and vestigial structures, can be used as evidence for biological evolution. What are vestigial structures?

Why would a drug the damages capsids treat a viral infection

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -

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?