<span>Mesozoic Era is the anwser</span>
Bone —> provides structure for the body.
Heart —> pumps blood through the body.
Stomach —> breaks down food into small particles.
Lung —> oxygenates blood.
Answer:
a) Mean - 10
b) mode - 9
c) Median - 9
d) SD - 2.708
Explanation:
A) Mean is the average of a given set of number in which the sum of all the number is divided by the number of entries
Thus, mean is equal to

B) Mode is the most common number in a given series
Thus, mode is equal to 9 as it has appeared twice
C) Median
Number are arranged in ascending order
7, 8, 9, 9, 10, 12, 15
The middle number is the median i.e 9
D) Standard Deviation
Formula is square root of sum of
divided by 


Answer:
Option D.
Explanation:
Crossing over is an important characteristic of meiosis which provides the genetic variation and various allelic combinations present in the offspring. Hence the answer is option D.