A scientist is examining cells under a microscope. Which would best help the scientist identify the tissue as plant or animal? A. The presence or absence of a cell wall

B. the presence or absence of DNA

C. Plant cells would be green

D. Animal cells would contain a nucleus

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Which would happen if more forests were cut down? a. the nitrogen cycle would be stopped b. nitrogen would be fixed by bacteria more quickly c. the amount of co2 in the atmosphere would increase d. fossil fuels would build up in the soil c the amount of co2 in the atmosphere would increase

Based on the law of dominance, we would expect percent of the offspring from this cross to have large teeth.

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them