Skeletal muscle contraction begins when calcium ions bind to

Which of the following statements is most likely correct about a rock belonging to the Jurassic age and a rock belonging to the Cambrian age? options: 1) They have identical fossils of organisms that have evolved over time.

Which is not a principle of the cell theory?

A younger student is trying to push a heavy box down the hallway. They are pushing as hard as they can, but haven't moved the box. Have they done any work? Why or why not?

As we grow, what happens to our cells? A. Our cells grow larger to support any height or weight we gain. B. Our cells will double in size. C. Our cells fill with protein the stronger and bigger we get D. Our body generates new cells.

Taphonomists would probably conclude that hominins had scavenged meat from an animal carcass they did not kill if fossil animal bones:

Which DNA bases pair with each other? How many hydrogen bonds are shared by each pair?

Which layers of sedimentary rock at Grand Staircase Escalante National Monument do you think are the oldest?

Animals in the higher trophic levels generally share two characteristics. They are typically

Name two ways that carbon enters the atmosphere

Omid is spending the semester in England where the road signs are in km. If he drives from his school into a town 6mi away, how many km will he drive?