the answer is 21<span>% oxygen, </span>
A semipermeable membrane is a type of biological or synthetic, polymeric membrane that will allow certain molecules or ions to pass through it by diffusion—or occasionally by more specialized processes of facilitated diffusion, passive transport or active transport.
Answer:
adding a catalyst
Explanation:
catalysts accelerate the speed of chemical reactions
Answer:
chloroplasts
Explanation:
photosynthesis takes place inside plant cells in small things called chloroplasts ( mostly found in the mesophyll layer) contain a green substance called chlorophyll
