Describe in two or more complete sentences which organs are involved in your immune system and how they fight off infections.

Explain how scientists use geologic time to determine the age of landforms.

[34 points awarded to the best answer, use facts and/or data] 1.) what's the likelihood of thunderstorms occurring in the state of maryland? {this question is for a project for science, use facts and/or data and explain why . 34 points to the best answer]

Why should organisms reproduce more offspring than will survive? select all that apply.