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bazaltina [42]
3 years ago
14

A. What gases were present in Earth's early atmosphere?

Biology
1 answer:
frutty [35]3 years ago
5 0

Answer:

The early atmosphere was probably mostly carbon dioxide, with little or no oxygen. There were smaller proportions of water vapour, ammonia and methane. As the Earth cooled down, most of the water vapour condensed and formed the oceans.

Explanation:

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3 Explain why the average height of students is increasing in many parts of the world.​
denpristay [2]
<h2> The average height of people in different nations has  has increased approximately by 10 centimeters.</h2><h3>It mostly comes down to nutrition and child-rearing styles. </h3><h3>Some scientists believe that the increase in teenage and out-of-wedlock pregnancies in the developed world may be an unanticipated consequence of improved nutrition.</h3>

Tobacco smoking greatly increased over the last hundred or so years, but the old wives' dictum was always that "Smoking will stunt your growth!"

Hope this helped have a good day = )  .

6 0
3 years ago
The largest unit within which gene flow can readily occur is a
notka56 [123]

Answer:

a. population

Explanation:

Gene flow cannot occur in hybrids because 99.9% of the time hybrids offspring are not fertile.

At genus level is not possible either because a hybrid is a cross breed at the genus level (horse-donkey).

A population is a group of species of 1 kind. A population of donkeys.

5 0
3 years ago
Which of the following tools should a scientist use to measure an object in meters.
Mekhanik [1.2K]

Answer:

C. Tape Measure

Explanation:

Thats the best of the options.

6 0
3 years ago
Which is the correct order of developer of the human embryo ???ASAP please
kari74 [83]

The initial stages of human embryogenesis.

8-cell embryo, at 3 days.

Blastocyst with an inner cell mass and trophoblast.

Trophoblast differentiation.

Histogenesis of the three germ layers.

Artificially colored - gestational sac, yolk sac and embryo (measuring 3 mm at 5 weeks)

Embryo attached to placenta in amniotic cavity.

7 0
3 years ago
Unspecialized human cells are called ____________.
Blababa [14]

Answer:

stem cells

Explanation:

Stem cells differ from other kinds of cells in the body. All stem cells—regardless of their source—have three general properties: they are capable of dividing and renewing themselves for long periods; they are unspecialized; and they can give rise to specialized cell types.

4 0
3 years ago
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