Power from a car engine is the power of a bicycle because a car engine does the same amount of work in time. Raul and Katrina equally shared a frozen lunch but heated each portion in two different microwaves. Katrina’s lunch was warm in one minute while Raul’s lunch took two minutes. The power used by Raul’s microwave must be the power used by Katrina’s because his microwave took time to do the same amount of work.

28. evolution

29. environment, survive, offspring  

explanation:

are their multiple choices ?

explanation:

their crystal patterns have been disrupted by stress

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.