The main form is carbon dioxide and methane
Sand and glass have different chemical formulas, so that means that the atoms are rearranged and this is a chemical reaction.
As many as there are needed. you just can't have many independent variables
Answer:
b. genes have no difficulty crossing the species barrier.
Explanation:
DNA is a universal molecule, by now it is known that has the same structure in pigs, birds, an other living things.
When a gene is transfer to other species, the most difficult action is that the living thing that is the receptor, can adopt this new sequence of DNA and reproduce it again as part of the new DNA.
In some examples like in pigs and humans, we are so closely that you can use some DNA pigs or tissues to replace in humans when is neccesary in a surgery.
