Oleanders are fully developed, vascular plants—with fully developed leaves, bark/stems, roots, tissues.
A.)Scientists look for fossils that could be common ancestors on the different
continents, showing that the common ancestor once existed on one or more
Because it need just plain water
Answer:
it affects the hardness of the shells because calcium has a high reactivity which causes the shell to be hard
Explanation:
The bond between one carbon atom and one oxygen atom is polar but due to the fact that there is another oxygen attached to the carbon which has the same electronegativity value as the oxygen on the other side, the effect of polarity is canceled.

is non-polar because the oxygens symmetrically alligned on the opposite sides of the carbon cancel the polarity effect.