Which of the following correctly explains why the first anaerobic organisms on earth are not classified as autotrophs? chemicals were not available for these organisms to produce their own food. oxygen was in abundance and it was more efficient to eat food rather than make their own. carbon dioxide was not present on earth at that time. the first organisms did not have sunlight available to make their own food.

Diego conducted an experiment to find out what kind of ball bounces the highest when dropped from a five-foot platform. he used a golf ball, a tennis ball, and a soccer ball. he dropped each ball from the balcony once. diego recorded his observations after each drop. what can diego do to best improve the reliability of his results? a) drop each ball from the platform three more times b) record his observations in more than one unit c) write at least two scientific questions after the experiment is complete d) share his results with other people who have done similar experiments you for the !

What should be the strand of complementary dna produced by the strand of dna shown below cgt ata

Which of the following is one way in which organisms such as clown fish and sea turtles are able to overcome the many dangers that their offspring encounter and ensure that their species population numbers stay relatively steady