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Tanzania [10]
2 years ago
13

Q40.is a proposed explanation for an observation.

Biology
1 answer:
Tcecarenko [31]2 years ago
3 0

Answer:

C. Hypothesis

Explanation:

Hypothesis is a proposed explanation for a certain occurrence and when the explanation is conclusive, then it becomes a theory.

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Rh blood factor is determined by:
Svet_ta [14]

Answer: Rh boold factor is determined by the presnce or absence of a particular erythrocyte protein

Explanation:

The Rh factor is an integral protein of the membrane of red blood cells (erythrocytes) and, by its determination, the blood type RH + or RH- is detected, -regardless of the types of groups known as 0, A, B and AB- .

People who are  RH + are those who have this protein in their red blood cells, and people with RH - refer to those who do not have the protein.

The Rh factor (Rhesus) was discovered by Karl Landsteiner and Wiener in 1940.

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I hope it is useful for you!. Regards. María

3 0
2 years ago
4. What is the mass of N2H4 gas in a 350.0 mL container at 50.0 °C, if the pressure of the gas is
vovangra [49]

Answer:

0.36g

Explanation:

Given parameters and conversion to standard unit

 To solve this problem we must assume ideality

Volume of N₂H₄  =  350mL  = 0.35dm³

Temperature of container  = 50°C  = 50 + 273  = 323K

Pressure  = 885torr;

               760torr  = 1atm

               885torr  = \frac{760}{885}   = 0.86atm

Unknown:

Mass of the compound  = ?

Solution:

The mass of the compound can be derived using the expression below;

         Mass = number of moles x molar mass

molar mass of N₂H₄ = 2(14) + 4(1)  = 32g/mol

To find the number of moles;

       PV  = nRT

          n  = \frac{PV}{RT}

P is the pressure

V is the volume

R is the gas constant = 0.082atmdm³mol⁻¹K⁻¹

T is the temperature

         n  = \frac{0.86 x 0.35}{0.082 x 323}   = 0.01mole

So,

    Mass  = 0.01 x 32  = 0.36g

5 0
2 years ago
Students in Ms. Nye's science class were using the microscopes to make slides of various organisms: algae, moss, onion cells, hu
ladessa [460]

the answer is chloroplasts

5 0
3 years ago
Read 2 more answers
Which disadvantage is associated with nuclear energy?
Olenka [21]

Answer:

b

Explanation:

because it can not be stored unless if cotaminated areas

8 0
3 years ago
Read 2 more answers
Cyanobacteria are important to the evolution and advancements of other life on earth because they
kompoz [17]

Answer:

Cyanobacteria are microscopic organisms found in all kinds of water. They are single-celled organisms and produce their own food from sunlight via photosynthesis. Cyanobacteria are important to evolution because they developed the oxygen atmosphere we live in by producing waste from cyanobacteria. Plants also evolved from Cyanobacteria.

3 0
3 years ago
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