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3 years ago

Why do zebras have stripes?

2 answers:

8 0

Some have suggested that the stripes may help zebras camouflage themselves and escape from lions and other predators; avoid nasty bites from disease-carrying flies; or control body heat by generating small-scale breezes over the zebra's body when light and dark stripes heat up at different rates.

Snowcat [4.5K]3 years ago

4 0

stripes may help zebras camouflage themselves and escape from lions and other predators

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The topics covered by the study of thermodynamics include:.

Dovator [93]

Answer:

a. energy changes during heating.

b. energy changes during chemical reactions.

c. color changes during chemical reactions.

d. Both (a) and (b)

Explanation:

The answer is D.Both (a) and (b)

6 0

3 years ago

True or False, according to the Megafauna Extinction Timeline, megafauna and humans arrived 50 thousand years ago?

SashulF [63]

Answer:

False

Explanation:

Megafauna are large animals that roamed the Earth during the Pleistocene Epoch, 1.6 million - 10,000 years ago.

4 0

3 years ago

PLEASE HELP!!!!!!!!!

andreev551 [17]

The average atomic mass of the imaginary element : 47.255 amu

<h3>Further explanation </h3>

The elements in nature have several types of isotopes

Isotopes are elements that have the same Atomic Number (Proton)

Atomic mass is the average atomic mass of all its isotopes

Mass atom X = mass isotope 1 . % + mass isotope 2.% ..

isotope E-47 47.011 amu, 87.34%

isotope E-48 48.008 amu, 6.895

isotope E-49 50.009 amu, 5.77%

The average atomic mass :

$\tt avg~mass=0.8734\times 47.011+0.06895\times 48.008+0.0577\times 50.009\\\\avg~mass=41.059+3.310+2.886\\\\avg~mass=47.255~amu$

5 0

3 years ago

How many grams of tris (mw 121.1) would you need to prepare 100 ml of a 100 mm tris solution? _________ grams?

Tems11 [23]

Molarity = (Mass/ molar mass) x (1/ volume of solution in Litres)

Mass = Molarity x molar mass x volume of solution in Litres

Molarity of Tris = 100 mM = 0.1 M

volume of Tris sol. = 100 mL = 0.1 L

molar mass of Tris = 121.1 g/mol

Hence,

mass of Tris = Molarity of Tris x molar mass ofTris x volume of Tris solution

= 0.1 M x 121.1 g/mol x 0.1 L

= 1.211 g

mass of Tris = 1.211 g

7 0

4 years ago

To save time, you can approximate the initial mass of the solid to the nearest ±1 g. For example, if you are asked to add 14.3 g

tensa zangetsu [6.8K]

Answer: Set with equal densities are:

15.2 g copper and 50.0 g copper ; 11.2 g gold and 14.9 g gold

Explanation:

Density is defined as mass of the substance present in unit volume of the substance.

$Density=\frac{Mass}{Volume}$

It is an intensive property which means that two different masses of same substance will have same value of density under same conditions.

So, from the given samples with equal density are:

15.2 g copper and 50.0 g copper will have the same value density.

11.2 g gold and 14.9 g gold will have the same value density.

6 0

3 years ago

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