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Lisa [10]
3 years ago
5

Two species of cicada have always lived in the same overlapping area since they diverged from their common ancestor. One species

emerges and mates every 5 years, and the other species emerges and mates every 13 years. These species are an example of _______ speciation with a ______ premating barrier.
a. sympatric, behavioral
b. parapatric, geographical
c. parapatric, behavioral
d. allopatric, temporal
e. sympatric, temporal
Biology
1 answer:
tiny-mole [99]3 years ago
7 0

Answer:

e. sympatric, temporal

Explanation:

Sympatric is when the species are not isolated physically form one another and prevented from mating with each other another. But because they mate at different seasons, it means temporal reasons prevent them from mating with each other.

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Which of these correctly describes how organic catalysts operate in biological reactions?
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<span>Out of the following given choices;</span>

a. they are used up in the reactions
b. they lower the overall energy of the reactions
c. they lower the activation energy of the reactions
d. they keep the temperature of the reactions constant

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Translate this to an equation.
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Explanation:

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Vikki [24]

Answer:

Fragmentation .

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White blood cells are a part of the body’s defense against infections. Based on the importance of these blood cells, which two s
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4 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
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