Question:
Researchers recently discovered a gene in humans that previously was unknown to science. Which statement best explains why the gene probably was not discovered much sooner?
Answer:
The technology used to study genes is still being developed.
Question:
Which sequence lists the levels of organization in the human body from simplest to most complex?
Answer:
cell -> tissue -> organ -> organ system
Question:
The best evidence that two land areas were once connected is the discovery that both land masses
Answer:
have similar types of rocks and fossils.
Question:
What is the smallest structural and functional unit of the nervous system?
Answer:
neuron