Answer:
The idea of concentrations and gradients within them is important when understanding the movement of substances across cell membranes. The more particles there are in a certain volume, the more concentrated those particles are. A solution with a low solute concentration has a high water concentration, and a high water potential.
I think the correct answer from the choices listed above is option B. A modification of the leaves into the spine in a cactus plant can be seen The spines are modified leaves. It helps defend the plant and also reduce the surface area which helps limit loss of water.
This is an example of positive feedback. Positive feedback is a cyclic process that can continue to amplify your body's response to a stimulus. The scratching worsens the histamine which makes you want to itch even more.
ANSWER: positive feedback
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Explanation:
1) regulating the production of specific proteins
Autotrophs are the producers, i.e. plants (they make their own food) so they gain their energy by converting light energy into chemical energy through the process of photosynthesis. Whereas heterotrophs (animals) cannot make their own food so they obtain nutrition through the consumption of autotrophs and other heterotrophs.