The circulatory aids with the immune system because they provide white-blood cells to help fight with the diseases or sicknesses.
As you can see in the picture presented below, the three classes of water have distinctive traits.
Pure substances contain only one element, they are not mixtures of different things.
The homogeneous mixtures have multiple elements, but they are so well blended together that you can't easily observe or separate them.
In heterogeneous mixtures, we can easily differentiate between different elements of the mixture.
I believe they cannot start with big trees and bushes because the there is not enough nutrients in the soil, so instead pioneer species pave the way for primary succession.
<span>The </span>second law of thermodynamics<span> states that the total entropy cannot decrease, </span>only<span> increase. This is why </span>living organisms<span> give off thermal energy: they lower their entropy, but the total entropy increases.</span>
Th answer is D its the best answer that fits the question .