The answers is white blood cells. White blood cells are the cells of the immune system, it defends the body against infection and disease. All white blood cells are produced and derived from multipotent cells in the bone marrow called hematopoietic stem cells.
Answer: <u>Option B; 100</u>
Explanation: If the cell is placed in a solution with 75 ppm calcium ions, then the cell will die, because water will enter the cells and they can burst. 75 ppm is quite a hypotonic solution for survival of bacterial cells. Same is the case will 125 ppm, here the cells will die because of dehydration. The increased solute concentration will make the bacterial cells to loose water and this principle is used in preservation.
100 ppm will provide the most stable environment because the water movement will occur at a same rate and the processes of the cell can proceed at required rate.
Answer:
"Differ groups of lions...."
"Lions mainly eat large animals, such as zebras."
"They compete for zebras with leopards and cheetahs."
Explanation:
Egg, zygote, 2cell-stage, 4 cell-stage, morula, blasocyst