Which situation below would have the strongest gravitational force between them?

A 10 kg mass and a 10 kg mass at 30 km apart.

A 2 kg mass and a 2 kg mass at 10 km apart.

A 10 kg mass and a 10 kg mass at 10 km apart.

A 10 kg mass and a 2 kg mass at 30 km apart.

the answer is b: 1.4 km/hr

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.

not only is it colder, it also becomes darker, less salty, and more dense.