The Average Density of Which of These Planetary Groups Is

question 120

Multiple Choice

The average density of which of these planetary groups is close to that of water (1000 kg/m³) ?

• A) Mercury and Venus because they are close to the Sun
• B) terrestrial planets because they are of relatively low mass and have been compressed very little by gravitational forces
• C) asteroids because they are very small objects
• D) large, outer planets because of their composition-hydrogen and helium

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Definitions:

Intraspecific Competition

Competition among members of the same species for resources such as food, space, and mates, which can influence population dynamics.

Unfavorable Environmental Factor

An external condition that negatively impacts the growth, reproduction, or survival of organisms, such as pollution or extreme temperature.

Competitive Exclusion

A principle that two species competing for the same resources cannot coexist at constant population values if other ecological factors remain constant.

Secondary Succession

An ecological succession that takes place after some disturbance destroys the existing vegetation; soil is already present. See succession.