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Leni [432]
3 years ago
15

According to the fossil record found in these sedimentary layers, what conclusion can be drawn about the movement of life to lan

d?
A) Land plants and mammals evolved at the same time.
B) As land plants became more complex, animal life did as well.
C) Mammals and insects evolved at about the same time in Earth;s history.
D) Flowering plants and trees became established before animals moved to land.
Chemistry
2 answers:
larisa [96]3 years ago
6 0

Answer:

B

Explanation:

I took the USA test prep

Andrei [34K]3 years ago
4 0

<em>A conclusion that can be drawn about the movement of life to land is that;</em>

B.) As land plants became more complex, animal life did as well.

<u>The plants have also adapted to reduce the water loss across cell walls. This is made possible by waxy cuticles.</u>

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Argon makes up 0.93% by volume of air. Calculate its solubility (in mol/L) in water at 20°C and 1.0 atm. The Henry's law constan
ivolga24 [154]

Answer : The solubility is, 1.4\times 10^{-5}mol/L

Explanation :  Given,

k_H = Henry's law constant  of argon = 1.5\times 10^{-3}mol/L.atm

First we have to calculate the pressure of argon.

Pressure of argon = 1.0atm\times \frac{0.93}{100}

Pressure of argon = 0.0093 atm

Now we have to calculate the solubility.

As, the solubility of argon in 1 atm pressure = 1.5\times 10^{-3}mol/L

So, the solubility of argon in 0.0093 atm pressure = \frac{0.0093atm}{1atm}\times 1.5\times 10^{-3}mol/L

= 1.4\times 10^{-5}mol/L

Thus, the solubility is, 1.4\times 10^{-5}mol/L

7 0
3 years ago
How do you balance this?
ad-work [718]
Weigh them both and there you go
8 0
3 years ago
What would be the mass of 1.98×10^28 molecules of H2O
zloy xaker [14]
The answer is 2035.44
5 0
3 years ago
Read 2 more answers
The compound borazine consists of 40.29% boron, 7.51%
ioda

Answer:

B_3H_6N_3

Explanation:

Hello there!

In this case, since the mass percentages in a compound which is wanted to know the molecular formula, can be assumed to be the masses, we first need to compute the moles they have in the formula unit:

n_B=40.29gB*\frac{1molB}{10.811gB} =3.73molB\\\\n_H=7.51gH*\frac{1molH}{1.01gH} =7.44molH\\\\n_N=52.20gN*\frac{1molN}{14.01gN} =3.73molN

Next, we divide each moles by the fewest ones (3.73 mol) in order to find the subscript in the empirical formula first:

B:\frac{3.73}{3.73}=1 \\\\H:\frac{7.44}{3.73}=2\\\\N:\frac{3.73}{3.73}=1

Then, the empirical formula is BH2N whose molar mass is 26.83 g/mol, so the ratio of molecular to empirical is 80.50/26.83=3; therefore, the molecular formula is three times the empirical one:

B_3H_6N_3

Best regards!

7 0
3 years ago
Someone please help me
Olegator [25]

Answer:

Newton's first law.

Explanation:

It is the same as law of inertia.

4 0
3 years ago
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