For the first one, electrons travel around the nucleus in fixed energy levels with varying energies.
Second one, protons, neutrons, and electrons have a mass, but electrons have far less mass
Third one, cations and protons
Fourth, not sure.
The answer will be 1 v.
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The answer is B: protects seeds
The Earth is a giant heat engine. The warm less dense tropical waters flow away from the equator and help moderate the climate of coastal areas. Eventually the heat is lost and the cooler denser water sinks and flows back toward the equator where the cycle is repeated.
<span>A change in the pattern would be very serious. Areas used to warmer waters could have colder weather, snow and ice. Trees, plants and animals used to warmer weather may die out. </span>
<span>A breakdown of this circulating system is one possibility that some scientists think caused the ice age.</span>
Answer:
B. The involved gene was on the Y chromosome.
Explanation:
