The lower the percent of energy required for a machine to perform work, the more energy efficient it is. true or false

An element's atomic number is 3. How many electrons would an atom of this element have?

Motorboats often wound or kill creatures in the ocean a. true b. false

What happens to chromosomes before mitosis begins

what does possible advantages does hydroponic gardening (growing plants in water) have over growing plants in oil?

Sandy completed pH and fecal coliform tests on water samples from the pond in her backyard. She reported the results in the following charts. What can you conclude about the water quality of Sandy's pond over the past year? Explain

Which molecule listed is most likely to cause osmosis in the body? protein glucose oxygen sodium chloride?

Why where phosphates removed from dishwasher detergents

When the sun reaches the end of released into space, forming a life cycle, the expanded part will be O A. red giant O B. brown dwarf c. white dwarf O O D. planetary nebula

Modern h. sapiens differ from the archaic form in that moderns have

Arid and semiarid lands are prone to desertification because of