Which explains what happens to a warm air mass at a warm front?
a.
a warm air mass overtakes a cold one, and the warm air rapidly rises and cools. the water in the air condenses to form clouds and severe thunderstorms.
b.
a warm air mass overtakes a cold one, and the warm air gradually rises and cools. the water in the air condenses to form clouds and severe thunderstorms.
c.
a warm air mass overtakes a cold one, and the warm air gradually rises and cools. the water in the air condenses to form clouds and moderate precipitation.
d.
a cold air mass overtakes a warm one, and the cold air gradually sinks and warms. the water in the air condenses to form clouds and moderate precipitation.

Option (C)

Explanation:

The warm fronts are the frontal surfaces that have a moderate slope. Here the warm and light air containing moisture becomes light and active and it eventually rises up over the dense cold air. This rising warm air then gets saturated and after condensation, they fall back in the form of moderate rainfall or snowfall. This precipitation usually takes place doe several areas over a comparatively large area. After precipitation, warmer and milder weather occurs in that area.

Hence, the correct answer is option (C).

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!

layer 3 is younger than layer 6.