Explain why driving on a road requires friction .how could you increase friction on an icy road

You cant increase though cause in ice the friction decreases theres some ways you can do this is with applying muds or amorphous powders of substances but it is not effective.

Driving on road requires friction cause friction causes the car to come to the state of rest if there's no friction than on applying brakes too the car wont stop and keeps on moving on and on due to intertia of motion.

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.

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .