1. Proteins
They are used by organisms for production of nucleic acids and repair damaged tissues. They can also be broken down to produce ATP during starvation.
2. Nitrogen
Nitrogen gas is abundant in the atmosphere but plants cannot directly absorb, they need nitrogen fixing bacteria to break it down into compounds (ammonia and nitrate) that plants can easily absorb for growth and chlorophyll build up.
3. Carbon dioxide
Used by plants to produce their own food (sugars) using energy from the sun and carbon dioxide from animals, releasing oxygen and water vapours i.e. photosynthesis.
Explanation:
The Hertzsprung-Russell diagram is a graph that plots the temperature of a star against its absolute magnitude or luminosity. It was created by astronomers Ejnar Hertzsprung and Henry Norris Russell about 1910, and can be used to chart the life cycle or evolution of a star.
Egg, zygote, 2cell-stage, 4 cell-stage, morula, blasocyst
The ribosome is responsible for protein synthesis in a ell