16 points how did cyanobacteria affect earth’s early atmosphere? a. they replaced oxygen with carbon dioxide in the atmosphere. b. they eliminated the harmful ultraviolet rays of the sun. c. they replaced carbon dioxide with oxygen in the atmosphere. d. they absorbed ozone molecules from the atmosphere.
Answers: 2
Biology, 22.06.2019 11:30, unknown6669
If a human has 23 pairs of chromosomes in every muscle cell of its body how many chromosomes will be in a human egg or sperm
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Biology, 22.06.2019 17:00, maleja2038
Some species of wasps are social. the queen starts a colony from scratch each spring. she builds a small nest, and lays and raises a group of female workers. the workers enlarge the nest while the queen continues to lay eggs. unfertilized eggs become males that mate with newly hatched females. all of the wasps except the newly fertilized females die by the summer. which best describes this behavior? a)it is beneficial only to the males that do not fertilize eggs. b)it is beneficial only to the female workers that are not fertilized. c)it is beneficial to each one of the individual colony members. d)it is beneficial to the whole species, but not to all of the individual members.
Answers: 1
16 points how did cyanobacteria affect earth’s early atmosphere? a. they replaced oxygen with carbo...
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