An aquatic food web consists of phytoplankton → krill → seals → sharks. the removal of which component is most likely to cause an immediate impact on the food web?
a) phytoplankton
b) krill
c) seals
d) sharks

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Aball horizontally thrown from a cliff at 8m/s

You are driving to the grocery store at 20 m/s. you are 110m from an intersection when the traffic light turns red. assume that your reaction time is 0.50s and that your car brakes with constant acceleration. how far are you from the intersection when you begin to apply the brakes? what acceleration will bring you to rest right at the intersection? how long does it take you to stop after the light changes? the known values: vi=20m/s xi=110m t=.50s vf=0m/s xf=0m a=?