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earnstyle [38]
4 years ago
11

What is the most efficient way to extract oxygen from the environment?

Biology
1 answer:
Karo-lina-s [1.5K]4 years ago
3 0

Answer:

a. Countercurrent

Explanation:

Countercurrent has been adapted from fish gills where the air is drawn from the blood flowing in the opposite direction to the water flowing to the gills.

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What happened to the worlds population around 500 years ago
IgorC [24]
It decreased because of the Black Plague
7 0
3 years ago
Which of the following is an example of evidence from comparative embryology that supports biological evolution?
Brut [27]

Answer:

The answer is A

Explanation:

Took the test and got it right.

6 0
3 years ago
71. After Precambrian Time, the basic divisions of the geologic time scale, from larger to smaller, are
Paul [167]
The answer is eons, eras, and periods.

A period is a basic unit in geology. Two or more periods form an era. Two or more eras form an eon. For example, Phanerozoic is the eon. It consists of three eras. These eras are Paleozoic, Mesozoic, and Cenozoic. Paleozoic is the era that consists of five periods. These periods are Cambrian, Ordovician, Silurian, Devonian, and Permian.
3 0
3 years ago
Which feature is most important for a chemical storage area?
Usimov [2.4K]

<span>The most important feature for a chemical storage area is chemical compatibilities. Incompatible substances must not be stored together. </span><span>Common storage problems can lead to mixing incompatible chemicals which is hazardous.  The most serious of these problems  is the storage of inorganic acids with flammable substances</span>

3 0
3 years ago
A graduated cylinder containing 40 mL of water has a total mass of 60 g. A solid object carefully lowered into the graduated cyl
Dafna11 [192]

Answer:

The correct answer is -

A) 35 g

B)30 mL

C)1.66666666666667g/ml3

Explanation:

Given:

mass of graduated cylinder containing 40 mL = 60 g

volume of water = 40 ml

increase in the level of water = 70 ml

increase in mass = 95

Solution:

A) mass of object -

increased mass - initial mass

90 - 60 = 35 g

B) volume of object

increased volume - initial volume

70 - 40 = 30 mL

C)  density d=m/v

d=35/30

d=1.66666666666667

8 0
3 years ago
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