Answer: The answer would be a stimulus this would be a stimulus because it is what causes the surroundings in an organism to change such as in its actions or behavior. I hope this helped you. Have a great night and god bless you :>
The answer is: "differences in temperature and salinity" .
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(based on the assumption that we are referring to the world's ocean).
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Fuels are materials that react with other substances to release nulear or chemical energy as heat. Chemical fuels release energy via combustion. Nuclear fuels release energy by nuclear fission. Nuclear and chemical fuels are used for different purposes because of the complexity of deriving heat from them, the amount of heat generated and use in various applications.
Ferns reproduce by spores, Conifers reproduce by seeds. Differences also exist in the root and stem structure. Neither Ferns nor Conifers have true leaves, Ferns have fronds and most Conifers have needles.
Hope this helped.
