I guess it is one ofA or C
Comparative and experimental investigations are two of three scientific investigations, the other is descriptive investigations.
--hope this helps--
Answer:
Option B, 
Explanation:
Given-
The average surface area of one foot pad of an elephant is

Weight of an Asian elephant is
newton
As we know, pressure is equal to total weight divided by total area of the surface on which it is concentrated.
Thus, pressure on one foot pad of elephant is 

Hence, option B is correct answer
Answer:
excretion is the action of expelling waste from one's body.
Explanation: