Answer: Receptors.
Explanation: Receptors. Receptors are groups of specialised cells. They detect a change in the environment stimulus. In the nervous system this leads to an electrical impulse being made in response to the stimulus.
Water is the compound. Iodine and calcium are elements, and air is a mixture
D. tends to increase of blood viscosity increases. I'm a bio major, hope I helped :)
Flowering plants reproduce by fertilization even if they are immotile by having their pollen be attached to the wings or bodies of other animals that touch them. This process is called animal pollination in which animals help to switch the genetics between different plants.
D. Chlorophyll a
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