The first one, <span>By having white blood cells to attack pathogens. this is because blood also has white blood cells. and the immune system has pathogens. so the blood cells help attack pathogens.</span>
A. To carry oxygen
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Answer:
jawless fish were earth 's first arthropods
This difference is that active transport needs energy, while facilitated diffusion does not need energy. The energy that active transport uses is ATP (adenosine triphosphate). ... Energy is needed in this form of transport because the substances are going against the concentration gradient.
Answer:
rocks and sediments, while the rest is located in the ocean, atmosphere, and in living organisms.
Explanation:
carbo is found in these places for example: