Answer:
External factors include physical and chemical signals. Growth factors are proteins that stimulate cell division. – Most mammal cells form a single layer in a culture dish and stop dividing once they touch other cells.
Explanation:
From Google
Answer:
Active transportation
Explanation:
Active transportation is happening because energy is need to pump against the gradient. Whenever energy is used the transportation is active.
the greatest biomass in most ecosystems are producers. This occurs because producers get there energy from the sun, the sun is the most available resource and so there are the most at that level.tion:
The legs of an insect are used to taste things walk jump and climb.
wings are for flying and sometimes camouflage
The mouth parts are for piercing and sucking their prey