The sun! It's solar radiation heats our planet, gives us light, and sustains life.
Answer:
The correct option is: (A) stem cells
Explanation:
The bone marrow is a semi-solid tissue which is generally found in the spongy portions of the bones. In the bone marrow, all the blood cells are produced from the unspecialized precursor cells, which are known as the stem cells. Firstly, the stem cells divide and form the immature blood cells. These immature blood cells then further divide and mature to form the mature blood cells.
Therefore, the stem cells are the precursor cells which transform and mature to form the blood cells.
Hey Rosalyn!
A nucleus in a cell, holds DNA and DNA is essential. If there is no nucleus, there is no cell. If you need further clarification, comment on my answer :)
C) To gather info about the natural world, to explain natural phenomena, and allow reasonable predictions of future events
because it helps to move something from one side to another
