True, though the Hadean period is one exception.
Answer:
Explanation:
They are found only in the zone of maturation, and not the zone of elongation, possibly because any root hairs that arise are sheared off as the root elongates and moves through the soil. Root hairs grow quickly, at least 1μm/min, making them particularly useful for research on cell expansion.
Answer: they are all prokaryotes
Explanation: because they all lack a nucleus to retain their DNA
