Nikol2003w Nikol2003w
  • 05-12-2017
  • Biology
contestada

1. Sex-linked disorders are carried on the Y chromosome, and they can only be expressed in males.

True or False?

2. How much of the Earth's atmosphere do scientist believe was made of oxygen 2.3 billion years ago?

A.) 70%

B.) 22%

C.) 1%

D.) 10%

Respuesta :

Аноним Аноним
  • 07-12-2017
anwser for #1. true and for #2. B.22% hope helps :)
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