![Biology](/tpl/images/cats/biologiya.png)
Biology, 12.08.2020 09:01, heyhay5748
Study the timeline. A timeline. 4.5 billion years ago, Earth is formed. 4.3 billion years ago, Earliest water. 4.1 billion years ago, Single celled life. 3.5 billion years ago, Earliest oxygen and photosynthesis. 2.5 billion years ago, Complex single celled life. 1.5 billion years ago, Multi cellular life. 500 million years ago, Land life. 300 million years ago, Dinosaurs. 200 million years ago, Mammals. 130 million years ago, Flowers. 5 million years ago, Humans. Based on fossil evidence, about how long ago did the first single-celled life form appear on Earth? 130 million years ago 1.5 billion years ago 2.5 billion years ago 4.1 billion years ago
![answer](/tpl/images/cats/otvet.png)
Answers: 2
Other questions on the subject: Biology
![image](/tpl/images/cats/biologiya.png)
Biology, 21.06.2019 16:30, biancaapere7
Ascientist is studying muscle twitches in chicken quadriceps. to activate the muscle, he needs to provide stimulus to the
Answers: 1
![image](/tpl/images/cats/biologiya.png)
![image](/tpl/images/cats/biologiya.png)
Biology, 22.06.2019 10:00, vadrian4056
Nephrons, the functional unit of kidneys, are responsible for formation of urine. the sentences describe situations that are the result of problems in the urine formation process. for the nephron shown below, match each situation to the step in the urine formation process where the problem lies.
Answers: 1
![image](/tpl/images/cats/biologiya.png)
Biology, 22.06.2019 10:30, alexianunez15
Which of the following is a good definition for the word adaptation? question 1 options: a trait that an organism survive and reproduce in its environment. a change in an organism's environment. the way in which animals obtain food. a temperature change that can cause the extinction of plants and animals.
Answers: 2
Do you know the correct answer?
Study the timeline. A timeline. 4.5 billion years ago, Earth is formed. 4.3 billion years ago, Earli...
Questions in other subjects:
![Konu](/tpl/images/cats/mat.png)
Mathematics, 11.01.2021 16:40
![Konu](/tpl/images/cats/geografiya.png)
![Konu](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 11.01.2021 16:40
![Konu](/tpl/images/cats/mat.png)
Mathematics, 11.01.2021 16:40
![Konu](/tpl/images/cats/mat.png)
Mathematics, 11.01.2021 16:40
![Konu](/tpl/images/cats/mat.png)
![Konu](/tpl/images/cats/en.png)
English, 11.01.2021 16:40
![Konu](/tpl/images/cats/ekonomika.png)
Business, 11.01.2021 16:40
![Konu](/tpl/images/cats/mat.png)
Mathematics, 11.01.2021 16:40
![Konu](/tpl/images/cats/istoriya.png)
History, 11.01.2021 16:40