Answer:
People <u>do need</u> a pump to push the water to the surface from confined aquifers.
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The answer is D. Chordata.
There are three domains of life - Archaea, Bacteria, and
Eukarya. All organisms that belong to the domains Archaea or
Bacteria have cell walls. In the domain Eukarya, there are some groups
that have cell walls and others that do not.
Chordata is phylum of the kingdom Animalia which belongs to the domain Eukarya. So, Chordata cannot be a domain.
Body b will have a force 4 times stronger than body a, causing body b to reverse the direction of body a