Matter cannot be created or destroyed. this means that the number of atoms before the reaction has to equal the number of atoms after the reaction.
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.
The brain is protected by the bones of the skull and by a covering of three thin membranes called meninges. The brain is also cushioned and protected by cerebrospinal fluid.
Answer:
a
Explanation:
they drop leaves and almost hibernate for the winter, like some animals!
