<span>The skeletal system also protects
internal organs and produces blood cells. Bones provide calcium that is
essential for the proper functioning of the nervous system. ... Sensory receptors in joints between bones send signals about body position to the brain. The brain regulates the position of bones by controlling muscles.</span>
This is where diffusion happens down the concentration gradient i.e. from high to low concentrations (just like simple diffusion) but facilitated diffusion requires a special and specific protein within the cell membrane. The substate binds to the receptor and the receptor itself changes conformation so that the substrate is now on the other side of the membrane. This is done for molecules that are too large to pass straight through the phospholipid bilayer (cell membrane) by simple diffusion e.g. glucose.
Answer:
Option B
Explanation:
Growth of trees would increase the amount of carbon dioxide (atmospheric carbon) taken in for photosynthesis while releasing oxygen into the atmosphere, effectively lowering the level of atmospheric carbon.
I would say it is answer c.
- In gymnosperms (plants with “naked seeds”—such as conifers, cycads, and ginkgo), the ovules are not enclosed in an ovary but lie exposed on leaflike structures, the megasporophylls.
Answer:
Producers create their own energy using photosyntehsis. They absorb light and water to make glucose. Consumers have to eat, they can't make their own energy.
Explanation:
