The diagram below represents a series of rock layers found at a particular location. Each different type of shape shown in the layers represents a fossil of a different species.

Suppose each symbol is related to a particular species in the following ways:
A red triangle represents a species of marine crustacean.
A green circle represents a species of jawless fish.
A yellow square represents a species of tree moss.
A purple star represents a species of forest-dwelling insect.
The change shown in the diagram at the end of the Devonian geologic period could best be explained by
A.
the melting of a glacier and development of freshwater lakes and rivers.
B.
the arrival of a new predator in the ecosystem.
C.
the environment changing from ocean to dry land.
D.
the environment changing from a cold climate to a warm climate.

c

Explanation:

the environment is changing from ocean to dry land

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.

multiplying and dividing the two decimals and the eqations by the same number of the overalls