The process by which organisms keep everything inside their bodies within certain limits is called
a. homeostasis.
b. evolution.
c. metabolism.
d. photosynthesis.

The process by which organisms keep everything inside their bodies within certain limits is called   homeostasis.

Homeostasis is the ability or tendency to maintain internal stability in an organism to overcome for environmental changes. An example of homeostasis is the human body keeping an average temperature of 37 C degrees.

According to definition, A option is correct.

that scientist would be robert hooke