A shell is considered as biotic (living) because it is a hard, rigid covering of many animals such as snail, sepia, pila, turtles, sea urchins. A shell is protective outer layer of these soft bodied animals. Shells are made of calcium carbonate in the form of calcite or aragonite crystallized in an organic matrix. Shells of other animals are composed of chitin, bone or cartilage. That's why a shell is considered as biotic (living).
Answer:
The correct answer is "because it came from something living".
Explanation:
In biology, a shell is defined as a protective structure of mollusks and crustaceans. A shell is considered to be biotic because it came from something living. Shells are not in fact alive as they are made of calcium carbonate and in some cases α-chitin, two non living materials. However, since mollusks and crustaceans are living beings, shells are considered biotic.
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The major contributions of Maury included:
fishery science
mapping the ocean bottom
oceanic chemistry
investigation of ocean currents
experiments with plankton
observation of ocean winds
Answer:
Animals and plants are associated with both divisions and phyla
As kingdom grows the more species are in the classifying group.
And since there are only a number of kingdom and thousand species, it would account that species changes more rapidly and exponentially grows than kingdoms.
Explanation:
B) Saturated fats have more carbon atoms than unsaturated fats.
C) Saturated fats have only single bonds on all the carbon atoms.
D) Saturated fats have only double and triple bonds on the carbon atoms