3 years ago

How did earth's atmosphere become oxygen-rich

Biology

1 answer:

Helen [10]3 years ago

6 0

<h2>ANSWER:</h2>

Cyanobacteria or blue-green algae produce oxygen

<h2>EXPLANATION:</h2>

Most scientists consider that toward half of Earth's 4.6-billion-year antiquity, the atmosphere carried about no oxygen. Cyanobacteria or blue-green algae became the leading microbes to generate oxygen by photosynthesis, possibly as long ago as 3.5 billion years ago and certainly by 2.7 billion years ago

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A 2-day-old infant who weighs 6 lb (2722 g) is fed formula every 4 hours. Newborns require about 73 mL of fluid per pound (454 g

Illusion [34]

Answer:

b. 2 2 to 3 oz (60 to 90 mL)

Explanation:

The answer would be 72.94 ml/times

In this problem, the infant is fed for every 4 hours.

Then, the frequency of feeding for a day would be: (24hours/day) / 4 (hours/times)= 6 times/ day.

The volume of feeding for a day that the infant need would be: $2722\times\frac{454}{73}$ = 473.68ml/day