The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth. Carbon is the main component of biological compounds as well as a major component of many minerals such as limestone hope this helps you pls thank me
^-^
Answer:
Germs
Explanation:
Germs is what forms all of the following, im not sure but I think germs would go in the blank
Climate, Land form/shape and fossils(he was most interested in this)
Answer:
In a comparison of birds and mammals, the condition of having four limbs is a shared ancestral character
the answer is a because if the model is based on experimental data it wont be good unless it has been tested.