A signal cascade is a series of chemical reactions which are triggered by a stimulus acting on a receptor that is then transduced to the intracellular space through second messengers. Finally, effector molecules receive the signal causing a cellular reaction to the initial stimulus. A signal cascade is very useful because it facilitates and accelerates the communication between cells that could be in different parts of a living organism. This communication is vital for cell processes in complex multicellular organisms.
Answer:
Conservation protects species from extinction, maintains and restores habitats, enhancing ecosystem services and protecting biological diversity
(WIKI but I reworded it)
Explanation:
WIKI and conservation is protecting species which leads to many things like the examples above.
B. the contraction and relaxation of the brain
a chemoreceptor would allow you to detect a smell .
