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scZoUnD [109]
2 years ago
12

Was the path to discovery of the theory evolution easy or difficult?

Biology
1 answer:
uysha [10]2 years ago
6 0

Answer: difficult ...

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In an energy pyramid, which level has the least available energy?*
Harman [31]

Answer:

The very highest level; this is because of the 10% rule in which 10% of the energy in a trophic level directly below one level is present in that level.

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3 years ago
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Explain how local environmental changes can have global effects.
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Changes in local environments can have global effects for several reasons. Animals, like birds, migrate from region to region. A change in one of their environments can cause behavioral changes which will affect other organisms living in these environments. Air and water move among regions.
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As the population of wolves increases, their prey decrease. This is most directly followed by which of the following? a sustaine
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The answer, I believe, would be C) A decrease in the wolf population - because the prey decreases, fewer wolves will be able to find food, which will lead to a decrease in their population. 
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How is enthalpy used to predict whether a reaction is endothermic or exothermic?
Radda [10]

<u>Answer:</u>

<em>329.48 KJ/mol heat is released by the combustion of 2 molof methane</em>

<u>Explanation:</u>

The value of enthalpy determines whether the reaction is exothermic or endothermic. If the enthalpy change is positive, then the reaction is endothermic (heat or energy released) and if the enthalpy change is negative then the reaction is exothermic (heat or energy absorbed).

2CH_4(g)+4O_2(g) => 2CO_2(g)+4H_2O(g)

\Delta H \ reaction=[ 2(\Delta HfCO_2)+ 4(\Delta HfH_2O)]-[2(\Delta HfCH_4)+4(\Delta HfO_2)]

                            =2 ( -(393.5 KJ)/mol)-[2( -74.6 KJ/mol)+4(-241.82 KJ/mol)]

                            = -787 KJ/mol-[ -149.2 KJ/mol-967.28 KJ/mol]

                           = -787 KJ/mol+1116.48 KJ/mol

                                          =329.48 KJ/mol

<em>In this question, </em><em>the enthalpy of formation</em><em> has positive value and hence the </em><em>reaction is endothermic</em><em> in which the heat is released. </em>

3 0
3 years ago
If you have an object with the density of 3.45 g/ml, and a mass of 45g, what is the volume of the object?
zmey [24]

Answer:

13 mL

Explanation:

4 0
3 years ago
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