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motikmotik
3 years ago
9

The first line of defense involves which structure(s)?

Biology
2 answers:
Airida [17]3 years ago
7 0

Answer: B / Skin

Explanation:It's the ansewr

kifflom [539]3 years ago
6 0

Answer:

Skin

Explanation:

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What do you notice about the two molecules?
anastassius [24]

Answer:

If it's in the table, it's an element! Atoms can join together - they form bonds together - to make MOLECULES. For example, two atoms of hydrogen hook together to form a molecule of hydrogen, H2 for short.

It would have been a little helpful if you added a picture but I hope this is helpful.Thank you!

Explanation:

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2 years ago
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What are the two<br> processes in which<br> almospheric oxygen<br> is absorbed?
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respiration and decomposition

Explanation:

Respiration is when animals breathe in oxygen and use it to produce energy, releasing carbon dioxide and water as by-products. In simpler terms, it is the act of breathing.

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2 years ago
What is the purpose of chromosomes in the nucleus?
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They are made of protein and one molecule of deoxyribonucleic acid (DNA). As the genetic material passes from parents to child, the chromosomes are responsible for containing the instructions that make the offspring unique while still carrying traits from the parent.

6 0
3 years ago
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Allen pours water into a graduated cylinder. He notices that the surface of the water is curved, as shown below.
Slav-nsk [51]

Answer:

When water is added to a graduated cylinder, having a surface where the sides of the water look higher than the center means that the curved surface is a concave meniscus which has formed because of surface tension (Choice C).

Explanation:

A meniscus is simply the curvature that the surface of a liquid acquires when it is in a container, such as a graduated cylinder. It is concave when there is attraction between molecules -water and glass- or it can be convex when both surfaces are repelled.

<u>Water is a polar molecule</u>, with the capacity to adhere to the surfaces it comes into contact with. This characteristic causes it to form a concave meniscus, as the outermost molecules adhere to the glass surface, while the surface tension of the water attracts the molecules from the centre downwards, causing the concavity.

Learn more:

Measuring with a graduated cylinder brainly.com/question/4070509

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