Students 4 heterotrophic by absorption and heterotrphic by ingestion
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.
Carbon can form single, double, and triple bonds with other carbon atoms.
A random sample is not biased