Answer:
Pure substances
Explanation:
Pure substances are made of only one type of atom or molecule. Hydrogen gas and pure iron are examples of pure substances. Hydrogen consists of hydrogen atoms only while iron consists of only iron atoms.
Answer:
the branch of science concerned with classification, especially of organisms; systematics.
Explanation:
An autotroph is an organism that can feed itself, like how plants feed themselves with photosynthesis. Autotrophs include flowers and other plants. It also includes other species that do this process. A heteroph is a organism that eats others for food. They can eat fungi and bacteria. They also can eat the things they are growing on.
Hope this helps you out!
A mutation is a genetic error in the creation of DNA. My science teacher compared it to a copier that made a mistake; the DNA is copied from others, but the "copier" messed up, making part of a helix different. Mutations can be genotypes or phenotypes.
