Answer:
A <u><em>receptor</em></u> is a protein that recognizes and responds to a signal.
Explanation:
A receptor is a protein molecule present on the cells on which the signalling molecules can bind and generate a physiological response. Some receptor molecules can also respond to Sun and light. Each type of cell has specific receptors molecules and hence can respond to specific signals. The receptor molecules hence tend to receive signals for a cell. Molecules such as hormones bind to the receptors.
Answer:
Rods
Explanation:
Rods are specialized photoreceptors that function best in low-light conditions. They are a major part of our vision in dimly lit environments, as well as our perception of movement in our peripheral vision.
Answer:
Ion i think
Explanation:
I think ion's contain more negative energy from electrons and since it's -18 and 9+ it would be -9 if u add them up
Answer: directional
Explanation:
Because only one trait was favored. When bears are cold, being bigger helps them better adapt to the coldness. Adjusting to the weather is one trait.
The definition of calories is a measure of energy in food, specifically the measure of heat needed to raise a kilogram or a gram of water by one degree Celsius.
