The correct term to fill in the blank would be voltage dependent channels. Channels in the membrane of the neuron allow ions to flow between the inside and outside of the cell. of these, voltage dependent channels open only when certain electrical conditions are met. These channels are transmembrane proteins that are activated by the changes in the electrical potential near it. The electric potential would alter the conformation of the proteins which in turn would regulate the closing and opening of the channels. The change in the electric potential is called the depolarization. Most of these channels are ion-specific like for the ions, calcium, sodium, chloride and potassium.
<span>It is believed that the coelacanths and lungfish (lobed fin fishes) represent a crucial link between other fishes and tetrapods. The major feature to support the hypothesis is : </span>Their fins have skeletal and muscular structures similar to amphibian limbs.
Explanation: All organism need energy to survive and carry out basic life functions. Mitochondria in these cells utilize ATP (which are energy molecules) to perform these functions. Even one cell can do this. ... These are all types of cell division that help categorize single-celled organisms as living organisms.
If a invasive species were to intervene in the food web then it would break the web because it if were to kill the species it attacked then the web would be broken and a native species might also do the same.
