16. What is osteoporosis? How can it affect bones? Why is calcium important to bones?

Precipitation that flows over the surface of the ground is called groundwater. True or False

Radiation, chemical agents and viruses cause

Lucy plans to buy a refrigerator. She wants a large model so it has enough space for all the food she needs to store so that she takes fewer trips to the grocery store. Lucy also wants a refrigerator that does not use too much electricity.

Which of the following is an example of how human activities are impacting the survival of species? wolves overfeeding on rabbits humans creating animal sanctuaries El Niño causing a shift in the migration of a school of fish Heavy rains causing a

What structures in cells contain DNA and proteins?

A healthy environment depends on bio geochemical cycles maintaining a balance of input and output. When forests are cut down, which process of the carbon cycle is most affected?

Aircraft that achieve forward propulsion by expelling a stream of fluid are called

The place where reactants bind to an enzyme during a reaction is called the

Interactions between actin and myosin filaments of the sarcomere are responsible for

What is the name for an organized group of cells that work togethe?