What is the force that holds the nucleus of an atom together?

A. strong nuclear force

B. electromagnetic force

C. weak nuclear force

D. gravity

A parabola has a vertex at the origin at (0,0). The equation of the directrix of the parabola is x=-4 In which direction does the parabola open? A) Up B) Down C) Right D) Left

The hands of a swimmer pushing backward against the water represent an action force. What is the reaction force?

The circulatory system of a vertebrate that uses lungs for respiration has A. Three or more loops. B. No loops. C. A single loop. D. A double loop.

How does an evolutionary interpret similarities in bone and other body structure

Describe a plant's circulatory system

How does global warming affect the temperate deciduous forest

Why do mutations make such a large contribution to bacterial genetic variation?

What part of a childs brain is resposible for licking and eating reflexes?

Which human body system do you most resemble to ribosomes and why?

What are roots made of?