All categories

3 years ago

From where do the placenta and umbilical cord develop?

Chemistry

2 answers:

leva [86]3 years ago

8 0

Answer:

outer cells of the blastocyst

Explanation:

on edg:)

Andreas93 [3]3 years ago

3 0

Answer:

it develops from the womb

You might be interested in

Salt in crude oil must be removed before the oil undergoes processing in a refinery. The

irina1246 [14]

Answer:

$\large \boxed{0.64 \, \%}$

Explanation:

Assume you are using 1 L of water.

Then you are washing 4 L of salty oil.

1. Calculate the mass of the salty oil

Assume the oil has a density of 0.86 g/mL.

$\text{Mass of oil} = \text{4000 mL} \times \dfrac{\text{0.86 g}}{\text{1 mL}} = \text{3440 g}$

2. Calculate the mass of salt in the salty oil

$\text{Mass of salt} = \text{3440 g} \times \dfrac{\text{5 g salt}}{\text{100 g oil}} = \text{172 g salt}$

3. Calculate the mass of salt in the spent water

$\text{Mass of salt} = \text{1000 g water} \times \dfrac{\text{15 g salt}}{\text{100 g water}} = \text{150 g salt}$

4. Mass of salt remaining in washed oil

Mass = 172 g - 150 g = 22 g

5. Concentration of salt in washed oil

$\text{Concentration} = \dfrac{\text{22 g}}{\text{3440 g}} \times 100 \, \% = \mathbf{0.64 \, \%}\\\\\text{The concentration of salt in the washed oil is $\large \boxed{\mathbf{0.64 \, \%}}$}$

3 0

3 years ago

When metals, non metals,and metallics are composed according to luster, which is best description of the appearance of metalloid

Nitella [24]

Answer:

Metalloids are metallic-looking brittle solids that are either semiconductors or exist in semiconducting forms, and have amphoteric or weakly acidic oxides. Typical nonmetals have a dull, coloured or colourless appearance; are brittle when solid; are poor conductors of heat and electricity; and have acidic oxides.

Explanation:

5 0

2 years ago

Early historical models of the solar system were geocentric. Which of these phrases describes a geocentric solar system?

likoan [24]

Answer:

Explanation:

3 0

2 years ago

Read 2 more answers

What goes in the blank?

Anon25 [30]

Protons goes in the blank. the word can be used for both.

5 0

3 years ago

What happend to the pressure of a gas inside a container if the temperatures of the gas decreases

ludmilkaskok [199]

There is an increase in the number of collisions between particles and the walls of the container. b. There is an increase in the temperature of the gas. If the volume of a container of gas is reduced, what will happen to the pressure inside the container

4 0

3 years ago