The ozone layer is supposed to block ultraviolet rays.
D responding to its environment
Bird, bat, and butterfly wings are examples of convergent evolution. <span>This means that all of these wings share the same function and are similar in structure, but each evolved independently. Bird, bat and butterfly wings are analogous, which means that they have separate evolutionary origins, but are similar because of the natural selection that shaped them to play a key role in flight.</span>
Answer:
A negative charge exists because of the electronegativity of oxygen. A polar water molecule is made up of hydrogen and oxygen. Due to its atomic structure, there is an unequal distribution of charges and thus oxygen gets a more negative charge while hydrogen gets a positive charge.
Explanation: