Before a star is born, the matter that will become the star exists as a

A bright, explosive supernova

Bred giant

C black hole

D cool, dark nebula

Ecosystems provide many services. Which of these is a service that moderates the environment in a way that benefits people? A. Artistic inspiration B. Education C. Recreation D. Climate stabilization

Suppose you increase your walking speed from 5 m/s to 14 m/s in a period of 3 s. What is your acceleration

An electromagnetic wave traveling through a vacuum has a wavelength of. 15 meter. What is the period of this electromagnetic wave?

If an atom gains two electrons in a chemical reaction, what is its charge? a Question 4 options: -2 -1 +2 +1

True or false? Radiant energy is generated by a petunia on Tuesday.

Hydroelectric power uses: wind water coal the sun

Two lightweight metal spheres are suspended near each other from insulating threads. One sphere has a net charge; the other sphere has no net charge. The spheres will: A. Attract each other B. Exert no electrostatic force on each other C.

Read the given list of organisms. squirrel, zebra, tortoise, rabbit, horse What best describes the role of these five organisms in a food web?

What are the SI units for specific heat capacity

What are starburst galaxies and what do they have to do with galaxy evolution?