Fossils are the preserved remains, or traces of remains, of ancient animals and plants
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An immune response is a reaction which occurs within an organism for the purpose of defending against foreign invaders. The first contact that an organism has with a particular antigen will result in the production of effector T and B cells which are activated cells that defend against the pathogen.
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Answer:
If it's triangles on one side it's a cold front
If it's a red line with semi circles then it's a warm front.
Answer: Has 3 times fewer hydrogen
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Answer:
windy, cold, long, constant(doesn't set), warmer
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