What does it mean for a cell membrane to be selectively permeable? a. it allows some substances to pass through but blocks the passage of others. b. it allows only water molecules to pass through.

Which is the correct formula for photosynthesis

Ascientist wanted to formulate a pill to attack a specific type of bacteria that infects the throat. which biological component would be best to use as a model for the pill's function? bacteriocytes phagocytes complement antibodies

Your sense of touch depends upon: a. direct contact b. heat chemical c. reactions d. pain