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lilavasa [31]
3 years ago
14

What is a sharks' skin made of?

Biology
1 answer:
FinnZ [79.3K]3 years ago
3 0
Shark skin is made of a matrix of tiny, hard, tooth-like structures called dermal denticles or placoid scales. These structures are shaped like curved, grooved teeth and make the skin a very tough armor with a texture like sandpaper.
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Tube A contains 1ml of phage stock that has been added to 9ml sterile media. Tube B contains 1ml from Tube A that has been mixed
natulia [17]

Answer:

1/1000 or 0.001

Explanation:

Serial dilution refers to the systematic dilution of the known concentration through successive suspension of initial volume to a fixed value of diluent.

In the given question, the serial dilution is performed in which the dilution factor will be

DF= volume of added solution / total volume of solution

For tube A

= 1/ 1+9

=1/10 or 10 folds.

For tube B

= 1/10 x 1/10

= 1/100 or 0.01

For Tube C

= 1/10 x 1/10 x 1/10

= 1/1000 or 0.001

Therefore, total dilution of tube C will be 0.001 or 1/1000.

6 0
3 years ago
Which type of carbohydrate is this?
mariarad [96]

Answer:

A

Explanation:

monosaccharide is derived from mono, meaning "one", and saccharide, meaning "sugar". The common monosaccharides are glucose, fructose, and galactose. Each simple sugar has a cyclic structure and is composed of carbon, hydrogen and oxygen in ratios of 1:2:1 respectively. Although each sugar mainly exists as a cyclic compound, it is important to note that they are all in equilibrium to a small extent with their linear forms.

While galactose and glucose are composed of six-membered rings, fructose has only five carbon atoms bonded to each other in ring form.

3 0
3 years ago
When blood loss is severe, the _____nervous system helps maintain blood pressure and divert blood to where it is needed?
ASHA 777 [7]
Sympathetic is the answer.


Hope this helps and good luck!
4 0
4 years ago
When the left ventricle contracts, blood flows to the?
Naddik [55]

Answer:

b) aorta

Explanation:

On contraction of the atrium, the atrioventricular valves open and push blood to their respective ventricles. Oxygenated blood from the left atrium moves to left ventricle. On contraction of ventricles, semilunar valves open and oxygenated blood from left ventricles is pushed into the aorta, a major artery which distributes blood to the body cells through different arteries.      

6 0
3 years ago
Read 2 more answers
Compare and contrast the immune system and nervous systems
balandron [24]

similarities:

The immune system and the nervous system maintain extensive communication, including 'hardwiring' of sympathetic and parasympathetic nerves to lymphoid organs. Neurotransmitters such as acetylcholine, norepinephrine, vasoactive intestinal peptide, substance P and histamine modulate immune activity.

6 0
3 years ago
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