How can you determine that a star is about to turn into a red giant?
A. When a large amount of hydrogen has been turned into helium
B. When a large amount of helium is turned into hydrogen
C. When the star falls into the sun
D. When the pressure inside the star exceeds its temperature
idk what subject this is so I'm putting it under biology

What is the difference between self-pollination and cross-pollination? question 2 options: self-pollination leads to the creation of a fruit. cross-pollination does not. during cross-pollination, ovules are carried from one plant to another plant.. during self-pollination the ovules stay on the same plant. during cross-pollination, ovules are carried from one plant to another plant.. during self-pollination the ovules stay on the same plant. during cross-pollination the pollen grains are carried from one plant to another plant. during self-pollination the pollen and ovules are from the same plant. during cross-pollination, the pollen grains travel from the stigma to the anthers. during self-pollination, the pollen grains travel from the anthers to the stigma.

What are chlorofluorocarbons made of

The many volcanoes located along the edge of the pacific ocean make up the ring of fire. how does subduction play a role in the volcanic activity in the ring of fire?