Why does the cell membrane not dissolve, since organisms bodies are mostly filled with water?

Ascientific idea becomes valid when it is what?

Which of these statements is true about autotrophs, but not heterotrophs? a. they use sugar and oxygen to make carbon dioxide and water. b. they use chlorophyll and oxygen to make carbon dioxide and water. c. they use sunlight, water, and carbon dioxide to make sugars. d. they use sunlight, water, and oxygen to make chlorophyll.

Which enzyme is responsible for “unzipping" the dna by breaking the hydrogen bonds between the nucleotides?