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❖ Watson and Crick were most well known for the discovery of the double helix. The double helix is the twisted ladder of DNA.
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Answer:
Mitosis: 2
Meiosis
Oogenesis: 1
Spermatogenesis: 4
Explanation:
Spermatogenesis
https://youtu.be/d5cQreR9h20
Oogenesis: Meiosis in Females, Part 1 of 2, Part 2 of 2, from Thinkwell's Video Biology Course
https://youtu.be/VPezOuOnq1g
https://youtu.be/pK7qjcgIox0
The carbon and oxygen cycles are closely related, because they are directly associated with photosynthesis and respiration processes. Oxygen constitutes about 21% of the atmosphere. In free form, oxygen (O2) is essential for aerobic respiration (eg by animals), where it is returned to the atmosphere as carbon-dioxide.