With the human heart there is a word bank and i need to fill the blanks it’s very important

Air pollution is only caused by human activity, select the best answer from the choices provided ot of true or false

Free brainliest! what is a characteistic of the american stradfordshire?

What evidence supports the law of conservation of energy? a) mechanical energy is converted to chemical energy during photosynthesis. b) oxygen is made from the breakdown of carbon dioxide during photosynthesis. c)energy is absorbed by chlorophyll and becomes chemical energy during photosynthesis. d)the sun gives off light energy that is absorbed by plants.