Answer: The sun
Explanation: Primary producers obtain their energy via the sun through the process of photosynthesis.
Molecules that have partially charged positive and negative areas are polar. Because water molecules are polar, water can dissolve many other polar substances. Water can also dissolve ionic compounds such as table salt.
No, a lot of our knowledge isn’t absolute.
There is a lot that is absolute, like "The Earth is round", but some knowledge is not guaranteed.
For example, people used to think "A fungus plus a algae make a lichen" but it’s actually a fungus, an algae and another type of fungus.
This just shows that we’re always learning new things about our world, and someday we might be proven wrong on something big!
Answer:
the cell membrane do all
but you can choose the first option cause it came first