The glands use ducts to secrete their substances onto a surface or into a cavity.

How many cells are our body made of ? ♡

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes

True or false most plants are c3 plants, because they use molecules of carbohydrate known as g3p in their photosynthesis process.