Janine is pushing a toy car along the floor. As the car moves, work is being done. The fact that the car is moving and work is being done shows that
A. cars are always working.
B. a force is not present.
C. energy is present.
D. the car is moving quickly.

Which of the following statements is true? a. the main cause for speciation is an increase in gene flow. b. organisms that reproduce asexually are not considered part of a species. c. on a tree of life diagram, speciation is shown by the merging of two different lineages. d.the size of the geographic area inhabited by a population can cause speciation.

Environmental differences within ecosystems are generally caused by

Which of the following is a consequence of urban heat islands? increased precipitation downwind of the city? increased precipitation upwind of the city? decreased winds within the city? increased winds within the city?