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.
Animal cells communicate via their extracellular matrices and are connected to each other via tight junctions, desmosomes, and gap junctions
Answer:
Adult cottonmouths are brown.
Explanation:
An observation is a fact that you can clearly see and don't have to guess if it is true or not.
Answer:
Astronomy.
Explanation:
Astronomy.
Astronomy is science of stars and cosmos. It is a natural science that analyses the objects and events of celestial bodies. To demonstrate their genesis and evolution, this uses maths, physics, and chemistry. Planets, moons, stars, nebulae, galaxies, and comets are of interest.
The Tropic of Cancer is the latitude circle 23.5 degrees north,whereas the Arctic and Antarctic Circles at ±66.5 degrees latitude.
