Besides burning fossil fuels what else have humans been doing that increased carbon dioxide(CO2) levels?

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?

In one or two well-crafted paragraphs in your laboratory journal, summarize the process in which normal cells become cancer cells. your paragraph(s) must include each of the terms listed below. underline each term in your writing: