What created oxygen in the early atmosphere

Photosynthetic bacteria

Asteroids hitting the earth

plankton

Volcanic eruptions

forests

A physical property for example round square rectangular or flat

Without selective breeding, horses would not have been domesticated.

Which of the following is/are part of the nitrogen cycle: a. eutrophication b. denitrification c. saturation d. all of the above

What is a cost of using technology to transport water?

What is one advantage of sexual reproduction over asexual reproduction? A. an increase in genetic variation B. an increase in genetic mutation C. a continuation in genetic weakness D. a decrease in genetic variation

What is unique about dogs?

3. The best thing you can do to keep a positive relationship with your supervisor is to

What contains both communities and ecosystems?

Which of the following represents a way that animals in a zoo are influenced by their environment? a. increased natural instincts b. decreased aggression c. unnatural behavior d. increased appetite

when the process of mitosis is correctly completed, the daughter cells should contain exact copies of all of on organisms genes. which biomolecule contains all of the organisms genes