The Moon and Mercury Lack ______

question 33

Multiple Choice

The Moon and Mercury lack ______.

• A) a core
• B) an atmosphere
• C) meteor impacts
• D) minerals
• E) a crust.

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Definitions:

Matter Cycle

The movement and exchange of organic and inorganic matter back into the production of living matter, involving processes like the carbon and nitrogen cycles.

Ecological Pyramid

A graphical representation that shows the biomass or bio productivity at each trophic level in a given ecosystem.

Producer Trophic Level

The first level in a food web, comprised of organisms that produce organic materials (usually through photosynthesis) from inorganic substances.

Base

A substance that can accept hydrogen ions (protons) or more generally, donate a pair of valence electrons; in nucleic acids, a nitrogen-containing molecule that forms part of the genetic code.