How did oxygen first enter Earth's atmosphere

Will Lithium and chlorine form and ionic bond? Explain.

Why are there so few aquatic plants and phytoplankton that live at the bottom zones in the ocean? a. the ocean floor contains many de composers b. most sunlight is absorbed before reaching these levels c. water is limiting factor d.

What kind of freshwater wetland has acidic water

Why do gerbils consume little water

Which of these choices is a sustainable practice of a postindustrial society? A. Lack of gardens B. Eradication of insects C. Fossil fuel dependence D. Efficient architecture

True or False All algae have roots, stems, and leaves.

How would a houseplant respond to sunlight that comes from one direction? A. by curling its stem around its leaves B. by closing its leaves at night C. by growing roots downward through the soil D. by bending its stem toward the sun

Hershey and chase used a dna-based virus for their work. How might the results have been different if they had used an rna virus?

State the function of DNA

How are proteins involved in DNA replication?