What force prevents a machine's actual mechanical advantage from reaching its ideal mechanical advantage?

A work

B friction

C gravity

D heat

Is light needed in the Calvin Cycle

How is the streak test used to identify minerals?

Which of the following accurately describes the relationship between photosynthesis and cellular resporation a. the reactant of photosynthesis are the products of cellular respiration and vice versa. b.

Which of the following is not part of the cell theory? A. Every living thing is composed of cells. B. Cells come from pre-existing cells. C. Cells are the basic unit and structure of all living things. D.

The main muscle of respiration is the

Why is dark matter difficult to measure? A) Because it does not exist in our galaxy. B) Because it disappears when it encounters ordinary matter. C) Because it creates so much heat it melts any instruments invented so far.

How is energy transferred from one organism to another

Explain why you need to get a flu shot every year.

Which of the following is a social consequence of global fuel dependence? a. rising costs of oil b. increase in atmospheric pollution levels c. poverty causing lack of access to fossil fuel resources d. an increase in the production of fossil fuels

The following flow of energy takes place in one ecosystem: alga → insect → larva flatworm → fish. Which trophic level has the most energy to pass on to the next? flatworm alga fish insect larva