Answer: This could be because of how humans as well as plants use that energy from the sun to create energy, but also because though energy from the sun is always on Earth, it can only provide light and energy to on side of the planet at a time. If energy from the sun were hit the earth from all angles it would increase the surface temperature.
Explanation:
They are held together by weak hydrogen bonds
If it is the abdomen and not the stomach area i would say its from the heat. if you've ever seen a dead animal on the side of the road over the course of a few days, they start to swell from the sun beating down on them all day.
The answer is macrophages. They either actively invade these leukocytes or are phagocytosed, divide in the cells and cause lysis. The promastigotes that invade these leucocytes are transformed into amastigotes in the macrophages. These amastigotes continue attacking other healthy macrophages while others migrate to the mid gut.