Prokaryotic cells lack a defined nucleus, but have a region in the cell, termed the nucleoid, in which a single chromosomal, circular, double-stranded DNA molecule is located.
When too much water is pumped out of an aquifer, you can make a sink hole above it, as there is now air/empty space where water used to be.
Are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels around the sun
Characteristics of Lancelets:
Small
Elongated
Marine invertebrate
Lacks a jaw
No sense organs
Has a notochord
Example: Lamprey
Characteristics of Tunicates:
Marine invertebrate
Has an outer coat that is rubbery or hard
Has two siphons
Examples: sea squirts, salps
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<span> the time period in which an embryo develops</span>
