How do scientists know that the universe is expanding?
The Doppler effect shows stars with yellow shifted light
The Doppler effect shows stars with green shifted light
The Doppler effect shows stars with red shifted light
The Doppler effect shows stars with blue shifted light

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

Which of the following is not a potential result of deforestation?

How does the nervous system affect the excretory system?