<span>Classification systems change over time for a variety of reasons, but the basic gist of the matter is that as we learn more about the natural world around us, these systems change to fit in with and around the new information. Whilst it is worth learning the current system of classification, it is also important to remember that this could always change at any time.</span>
Answer:
I'm pretty sure it's transport blood cells
Well, nitrogen is the gas that makes up 78% of the earth's atmosphere.
I would guess its in the air that we breathe. I am not really sure. Just basing this answer off of research.
D. To help oxygen get into blood vessels
The fruit should have a seed that's light enough to be carried by the wind. Plants like orchids, dandelions, and cottonwood are plants that have seeds that seem like they have "wings" because of the feathery bristles that they have on top of them. These seeds are lightweight and are more often carried out by the wind for pollination.
