Use the image below to answer question 1.
20 N on the left side of skateboard
10 N on right side of skateboard
1. The skateboard above moves at a constant
velocity before the two forces shown
suddenly act on it. What happens to the
skateboard?
A The forces are balanced, so the
skateboard accelerates.
B The forces are unbalanced, so the
skateboard accelerates.
C The forces are balanced, so the
skateboard continues moving at the
same velocity.
D The forces are unbalanced, so the
skateboard continues moving at the
same velocity

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

This is the diveristy of ecosystems natural communites and habits it is the variety of ways that species interact with each other and their environment

Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.