Biology, 30.11.2019 05:31, WhiteWinterRose
When cyanobacteria first appeared on earth, the earth's atmosphere contained little oxygen. cyanobacteria are thought to be responsible for bringing the oxygen in the earth's atmosphere to present levels. this appearance of oxygen and the beginning of aerobic life was made possible by the development of:
Answers: 2
Biology, 22.06.2019 16:20, idkjules5728
Select the correct answer. which statement applies only to the axial skeleton, not the appendicular skeleton? a. it contains a pivot joint. b. it has muscles attached that work in pairs. c. it contains red bone marrow. d. it possesses fossa for bone articulation. e. it protects the heart and lungs.
Answers: 2
Biology, 22.06.2019 21:00, Shihhschool20
Which of the claims below does this model support? select all the claims that are supported
Answers: 3
Biology, 22.06.2019 22:30, JaylahtheSmarrtie
Afive-year study was carried out on a population of algae in a lake. the study found that the algae population was steadily decreasing in size. over the five-year period this decrease most likely led to
Answers: 3
Biology, 23.06.2019 00:30, avavackity
Which term is applied to a scientist who studies ancient life, including animal and plant fossils? a- paleontologist b- geophysicist c- dendroclimatologist d - anthropologist
Answers: 2
When cyanobacteria first appeared on earth, the earth's atmosphere contained little oxygen. cyanobac...
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