Describe how a desert biome differs from a rain forest biome: How does the temperature differ?
How does the precipitation differ?
• How are the plants different?
• How is the soil different?

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.