1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lorasvet [3.4K]
3 years ago
15

From where do the placenta and umbilical cord develop?

Chemistry
2 answers:
Anastasy [175]3 years ago
8 0
It’s either the first or second one

I think it’s the first one - the outer cells of the blastocyst
frozen [14]3 years ago
5 0

Answer:

When an egg is fertilized, it divides into two components — one becomes the embryo, which develops into the fetus, and the other becomes the placenta, which grows along the lining of the uterus. The umbilical cord develops from embryonic tissue and will grow about 60 centimetres long.

The umbilical cord develops from and contains remnants of the yolk sac and allantois. It forms by the fifth week of development, replacing the yolk sac as the source of nutrients for the embryo.

OR put simply

A, the oyster cells of the blastocyst.

You might be interested in
HURRY WILL MARK BRAINILEST
DanielleElmas [232]
I don’t know the author or what book/literary work this is, but could be how proteins are produced.
8 0
3 years ago
Read 2 more answers
7. Which statement is true about particles in ice and in boiling water?
IceJOKER [234]

Answer:

A. particles are the same.

Explanation:

Hello, since we are talking about the water, the molecules are quite equal.

Nonetheless,  if you want to know it (because this is not in the answers), the particles move faster in the boiling water than in the ice, considering that in the boiling water there is a larger energy content, which allows the molecules to move faster (they "have" more energy). In addition, The molecules are closer in the ice because that is the only way for them to solidify (get together).

Best regards!

6 0
3 years ago
During the discussion of gaseous diffusion for enriching uranium, it was claimed that 235UF6 diffuses 0.4% faster than 238UF6. S
Kay [80]

<u>Answer:</u> The below calculations proves that the rate of diffusion of ^{235}UF_6 is 0.4 % faster than the rate of diffusion of ^{238}UF_6

<u>Explanation:</u>

To calculate the rate of diffusion of gas, we use Graham's Law.

This law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows the equation:

\text{Rate of diffusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}

We are given:

Molar mass of ^{235}UF_6=349.034348g/mol

Molar mass of ^{238}UF_6=352.041206g/mol

By taking their ratio, we get:

\frac{Rate_{(^{235}UF_6)}}{Rate_{(^{238}UF_6)}}=\sqrt{\frac{M_{(^{238}UF_6)}}{M_{(^{235}UF_6)}}}

\frac{Rate_{(^{235}UF_6)}}{Rate_{(^{238}UF_6)}}=\sqrt{\frac{352.041206}{349.034348}}\\\\\frac{Rate_{(^{235}UF_6)}}{Rate_{(^{238}UF_6)}}=\frac{1.00429816}{1}

From the above relation, it is clear that rate of effusion of ^{235}UF_6 is faster than ^{238}UF_6

Difference in the rate of both the gases, Rate_{(^{235}UF_6)}-Rate_{(^{238}UF_6)}=1.00429816-1=0.00429816

To calculate the percentage increase in the rate, we use the equation:

\%\text{ increase}=\frac{\Delta R}{Rate_{(^{235}UF_6)}}\times 100

Putting values in above equation, we get:

\%\text{ increase}=\frac{0.00429816}{1.00429816}\times 100\\\\\%\text{ increase}=0.4\%

The above calculations proves that the rate of diffusion of ^{235}UF_6 is 0.4 % faster than the rate of diffusion of ^{238}UF_6

3 0
3 years ago
How many mols are in 15 of mg (0H) 2
SpyIntel [72]
The answer is 0.0171468704904. We assume you are converting between moles Mg(OH)2 and gram. This compound is also known as Magnesium Hydroxide. 1 mole<span> is equal to </span>1 moles<span> Mg(OH)2, or 58.31968 grams.</span>
5 0
3 years ago
Which model is most likely used to show something that happens too slowly to see? 1.A model of a weather system 2.A model of mou
Anastaziya [24]

Answer:

model of mountain formation

Explanation:

The formation of mountains takes millions of years. This formation of mountains involves so much processes that do not occur quickly.

Hence, a model that can adequately show something that happens very slowly is the model for the formation of mountains.

7 0
4 years ago
Other questions:
  • If 72.1 mL of 0.543 M H2SO4 completely titrates 39.0 mL of KOH solution, what is the molarity of the KOH solution? a. 0.317 M b.
    15·1 answer
  • A sample of 0.53 g of carbon dioxide was obtained by heating 1.31 g of calcium carbonate. what is the percent yield for this rea
    5·2 answers
  • Is it okay to eat with my hands even though they're stained with silver nitrate?
    13·2 answers
  • Saturated fats are typically liquid at room temperature. saturated fats are typically liquid at room temperature.
    7·1 answer
  • A chemical reaction gives off 1,500 kj of heat energy. about how many calories is this? (1 calorie = 4.18 joules)
    8·2 answers
  • What is the center of a cell called
    7·2 answers
  • The light and dark circles in the picture represent different types of atoms. Which picture best represents a pure compound?
    14·1 answer
  • Which mineral is composed of calcium and fluorine?
    7·2 answers
  • A solution generally consists of two parts, a solute that is dissolved and a solvent that the solute is dissolved into. For exam
    15·1 answer
  • Classify Sr(OH)2 as a strong<br> base or a weak base.<br><br> Strong Base or Weak Base
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!