Awarm front is associated with which of these? a. a rising warm air mass b. a moving cold air mass c. air masses that are not moving d. air masses that have trapped warmer air between them

B. a moving cold air mass

A warm front is defined as the transition zone where a cold air mass is replaced by a warm air mass. Warm fronts generally move from southwest to northeast (not rising, but moving nor trapped)  and the air behind a warm front is warmer and more moist than the air ahead of it.

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.

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.