Amarble is flicked off the edge of a table. the motion of the marble follows a parabolic path.

which is true about the motion of this marble?

a.
no continuous forces are acting.

b.
two continuous forces are acting on the marble.

c.
only one continuous force is acting on the marble.

d.
two instantaneous forces are acting on the marble.

What changes occur in the brain during the teenage years? 25 points, someone me out!a.) thinking becomes slower as the brain grows larger. b.) connections between neurons become stronger and faster. c.) unused neurons fuse together to form larger, better functioning neurons. d.) more neurons are developed.

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?

The substances that are necessary for producing of certain hormones and that store and transport vitamins