Dont worry those are just variables. a. and b. is the same as 1 and 2 !
There are only so many resources that can be used and if all of them are used they don't have enough materials or food.
I can certainly see how this is likely to be a science book. With the latest photographic technology scientists have photographed everything from star nebulas, space gases, to exoskeletons of creatures, flowers, sun flares, waves in motion, inside cells, etc. so yes absolutely!
Answer:
A) NaCl will be exported from the red blood cells by facilitated diffusion.
Answer:
The stored energy in the wood is chemical energy, meaning that it can be released by a chemical reaction (burning). It's closely related to those fossil fuel energies, because the chemical energy was formed by photosynthesis, using energy from sunlight as the input.
Explanation:
