The main difference between the four nucleotides that make up DNA is that they have different ...

A. Sugars

B. Uracil

C. Bonds

D. Bases

A person has just bought a new electric car. She says that because she has an electric car, she does not use any non-renewable resources when she travels. How correct is she?

Which sequence of eons, from oldest to youngest, is correct? which sequence of eons, from oldest to youngest, is correct?

How do plants get nitrogen? by carrying out photosynthesis by absorbing it from soil by carrying out nitrogen fixation or by absorbing it through evaporation

What kinds of evidence might scientists be collecting about a volcano

Analyze how your life might be different if you could make your own food through photosynthesis

What is the name of the process by which a cell will uptake large molecules from the extracellular fluid?

What evidence shows that the Moon's gravity affects the Earth?

Scientists claim that global climate change is threatening many species with extinction. Which statement provides the strongest evidence for this claim?

What is a trait, what are genes? How are they related to each other?

Squamous cell carcinoma and basal cell carcinoma are both cancers of cell tissue of the skin, lining of the blood vessels, respiratory, intestinal, urinary tracts, and other body systems. These carcinomas are found in what type of tissue?