<span>Photoplankton is one of the producers that can be found in the polar regions.</span>
The answer is signal transduction. It is also known as cell signaling. It is the transmission of molecular signals beginning from a cell's exterior to its interior. Signals got by cells must be transferred efficiently into the cell to make certain a suitable response. This step is started by the cell-surface receptors.
<span>A major reason for Herbert Hoover’s landslide victory in the 1928 election was the prosperity of the 1920's. In the early 1920's there was a large economic boom and Herbert Hoover pledged to continue that. </span>
The first one, the third one, and the last one :)
Animal cell is described as the 3rd tropic level
