Oxygen was absent in Earth's early atmosphere. When oxygen levels rose in the atmosphere, what likely occurred?
A. Some life went extinct.
B. Some life survived in a few habitats without oxygen. C. All of the above.
D. Some life survived because it had adaptations and/or evolved metabolism that used oxygen.
Answers: 3
Biology, 21.06.2019 16:30
Which organism is the producer in this food web? 7th grade question. a) arthropods b) birds c) fungi d) plants
Answers: 1
Biology, 21.06.2019 23:00
How do chloroplasts set plants apart from other living things
Answers: 1
Biology, 22.06.2019 09:30
Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these
Answers: 2
Biology, 22.06.2019 18:50
Which if the following best describes why invertebrates isn’t considered a scientifically valid word when classifying animals
Answers: 1
Oxygen was absent in Earth's early atmosphere. When oxygen levels rose in the atmosphere, what likel...
Computers and Technology, 10.05.2021 07:10
Mathematics, 10.05.2021 07:10
English, 10.05.2021 07:10
English, 10.05.2021 07:10
Physics, 10.05.2021 07:10
Mathematics, 10.05.2021 07:10
Mathematics, 10.05.2021 07:10
Spanish, 10.05.2021 07:10
Engineering, 10.05.2021 07:10