All living things have four basic needs to live and function. List these four needs.

You have an simple of an unknown mineral. It can scratch fluorite but not quartz. What is it's approximate hardness?

You're conducting a science experiment and notice that fruit flies with rounded wings produced more offspring. What does this suggest about rounded wings?

Which of the following refers to a bone disorder found most often in the aged and resulting in the bones becoming porous and light? a. osteomalacia b. osteoporosis c. rickets d. Paget's disease

Why do cells have a plasma membrane? to separate proteins from the nucleus to define the size of the cell to separate the inside of the cell from its environment to distinguish plants from animals

Which type of change was seen in the ecosystem around mount st. helens after it erupted?

Fenway park, home of the boston red sox, is situated on land that was once a fen, a kind of wetland. the replacement of the fen is an example of what? pollution overexploitation habitat destruction competition

Explain how the terms set below is related: Heterotroph, omnivore, carnivore

Which of the following are atoms of the same element? Check all that apply. an atom with eight protons and seven electrons an atom with nine protons and seven electrons an atom with eight protons and eight electrons an atom with eight protons and no

What are the two reasons oxygen and carbon dioxide can move easily across the cell membrane?

Which component of blood is responsible for the formation of blood clots? a. all blood cells b. red blood cells c. myoglobin d. platelets e. white blood cells?