When a warm air mass and a cold air mass stall next to each other it’s called a(n) front.

cold
occluded
stationary
warm

stationary

Explanation:

It's called a stationary front because the gases remain stationary next to each other because neither is strong enough to replace another.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.