1. two points
2.respiratory and organs
3.heart and heart
4.homogenous process/system
Meter is the SI unit for length. :)
Making rough estimate of physical quantities is useful because it allow us to have an idea of how big or small a quantity is, it gives us the near result of the real quantity a matter contains. The approximate quantity obtained will give us information about the size of the quantity.
I also believe the answer is A.
ANSWER:
In the animal kingdom mammals have largest natural breasts.
EXPLANATION:
Mammals have largest breasts in animals and specifically Blue Whale has the largest breasts but they are inside the body.Among other animals goats, cows and buffaloes have larger breasts too but surely not greater than the size of Blue Whale's.Breasts are organs in which mammary glands are present, these glands produce milk.
