Describe the relative positions of earth, the moon, and the sun for a spring tide and for a neap tide

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere