Answer:
Explanation:
Because they appeared quickly in geological time, and moulted like other arthropods, trilobites serve as excellent index fossils, enabling geologists to date the age of the rocks in which they are found. They were among the first fossils to attract widespread attention, and new species are being discovered every year.
The answer to this question is in fact the Lungs.
D because gravitational force cannot pull or push
Answer:
Red, shade of red may depend on the oxygen level in it.
Explanation:
