Choose the phrase that best describes work being done by someone's arms.
a. a child building a sand castle
b. a mother holding a baby
c. a boy pushing on a tree
d. a traveler carrying luggage

In each transformation of energy , some energy what?

How do the evolutionary chart and the video support the claim that all living things are made up of cells?

Why are carbon dioxide concentrations expected to increase? a carbon dioxide concentrations are expected to increase, because fossil fuel burning is expected to increase b. carbon dioxide concentrations are expected to increase, because of an increase in agriculture. c.carbon dioxide concentrations are expected to increase, because more land will have to be cleared for increasing populations and agricultural use. d. all of the above select the best answer from the choices provided mark this and return save and exit next submit submit