Population density is the study of how many people live in some area as compared to other areas - this helps for example predict whether the area can preduce enough food for itself. It is measured in the number of people per a unit of area.
The correct answer then is:
<span> the number of people who live in a square mile or kilometer</span>
The species was not able to adapt to changing environmental conditions.
Answer:
Explanation: The groups have been living together and learning from one another for centuries, while blending with other influences — Spanish, African, Caribbean, German, Irish, and Italian, to name a few — in Louisiana's melting pot.
Answer:
Vertebrates can be classified into five groups, based on their skin covering, how they reproduce, how they maintain body temperature, and characteristics of their limbs (arms and legs, or their equivalent such as wings or fins).
Explanation:
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Organisms that are buried in sediment may decay or dissolve away leaving a mold<span>. If the space is subsequently filled with sediment, an external </span>cast<span> can be made. </span>Molds<span> and </span>casts <span>are three dimensional and preserve the surface contours of the organism.</span>