Which of the following is an alkali metal? question 2 options: magnesium (mg) nickle (ni) calcium (ca) rubidium (rb)

Which traits do human embryos have that link them to a common ancestor with fish and reptiles? a. scales and tail b. gill slits and scales c. tail and gill slits d. hair and tail

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.

20 pts ‼️ an unmanned spacecraft travels to mars. mars has a lower strength of gravity than earth. where in the image is the spacecraft’s weight the greatest?