Carbon dioxide makes up less than 1 percent of Earth's atmosphere, and oxygen makes up
about 2...
![Biology](/tpl/images/cats/biologiya.png)
Carbon dioxide makes up less than 1 percent of Earth's atmosphere, and oxygen makes up
about 20 percent. These percentages are maintained most directly by
A)
respiration and photosynthesis
the ozone shield
C)
synthesis and digestion
D)
energy recycling in ecosystems
![answer](/tpl/images/cats/otvet.png)
Answers: 3
Other questions on the subject: Biology
![image](/tpl/images/cats/biologiya.png)
Biology, 22.06.2019 02:30, florochoa217
Plz ! a scientist wants to produce a cow that makes a particular human protein in itβs milk the desired protein causes blood to clot and can be used to treat hemophilia (a blood clotting disorder). which of the following would be best for the scientist to use? a. genetic crosses. b. cloning. c. selective breeding. d. genetic engineering.
Answers: 1
![image](/tpl/images/cats/biologiya.png)
Biology, 22.06.2019 07:00, victorialeverp714lg
According the inverse square law, doubling the distance from the source of the sound, a speaker, for example, will drop the sound 6 db each time. if you were standing in the back of an auditorium, 32 feet away from a speaker not using any amplification, would you be able to hear a speaker clearly? why or why not?
Answers: 2
![image](/tpl/images/cats/biologiya.png)
![image](/tpl/images/cats/biologiya.png)
Biology, 22.06.2019 09:30, maggie123456751
Hemoglobin is a proton that carries oxygen around the body what is hemoglobin made from
Answers: 1
Do you know the correct answer?
Questions in other subjects:
![Konu](/tpl/images/cats/health.png)
Health, 14.07.2019 15:30
![Konu](/tpl/images/cats/en.png)
English, 14.07.2019 15:30
![Konu](/tpl/images/cats/biologiya.png)
Biology, 14.07.2019 15:30
![Konu](/tpl/images/cats/istoriya.png)
History, 14.07.2019 15:30
![Konu](/tpl/images/cats/mat.png)
![Konu](/tpl/images/cats/mat.png)
![Konu](/tpl/images/cats/mat.png)
![Konu](/tpl/images/cats/mat.png)
![Konu](/tpl/images/cats/mat.png)
Mathematics, 14.07.2019 15:30