You're in the Ecology & Evolution class at OU aren't you? This is the exact same question, word for word, from Unit Four of that class. You should be ashamed of yourself trying to get answers this way. How about doing a little research and using your brain.
Many things: ionizing radiation, free radicals, various chemicals, copying errors, retroviruses, etc.
Plants and other organisms
it provides nutrients to other organisms
They form sedimentary rocks
to helpso that every scientist in every nation uses the same universal namehelps avoid confusion and duplication of the name
plants,animals, and water :) u welcome
to see micro organisms
yes
he placed organisms into groups based on their observable features
cyanobacteria
i dont know thats why im asking you
It's common sense that organisms with similar DNA are more related evolutionary-wise. Analyzing DNA can help us determine which organisms evolved from which organisms.