Answer:
The correct answer will be option- bone marrow.
Explanation:
Hematopoiesis is the process of the formation of the cellular components of the blood from the stem cells.
The cellular components are formed in the hematopoietic system which includes liver, bone marrow and spleen.
In infants, the blood cells are formed continuously from the liver, spleen and bone marrow but in adults, the blood cells are formed from the bone marrow mainly.
Thus, option- bone marrow is the correct answer.
The 50 pound object will reach the ground first.
Explanation:
Using the second equation of motion, we can derive the time taken for each of the object to reach the ground. As the object is thrown from the top of the bridge or cliff, acceleration due to gravity will be acting on them.
So, 
The value of s for the object thrown from 50 foot bridge is given as 50 ft. The initial velocity of the object will be zero. The acceleration can be written as the ratio of mass to gravitational force.
Then, 


Then, consider the time taken for the 50 pound object to reach the bottom of 100 ft cliff as t₁ and the displacement in this case is 100 ft.
Then, 

Since, the gravitational force acting on both the objects will be same, the ratio of time taken is

So, the time taken for the 20 pound object to reach the ground of 50 ft bridge is √5 s =2.236 s and the time taken for the 50 pound object to reach the ground of 100 ft cliff is 2 s.
Thus, the 50 pound object will reach the ground first.
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Answer:
The population history of the island remains highly controversial. In addition to internal conflict, the population crash has been attributed to “ecocide,” in which the Island's resources were exhausted by its inhabitants, reducing its ability to support human life.
Explanation:
I believe you mean legs. If you do, the answer you are looking for is: All spiders have eight legs. They also have two small appendages at the front that are modified legs; these are called pedipalps.