Why are modern light microscopes better than the ones Leeuwenhoek used?
A) Modern microscopes have a fivefold better resolution.
B) Modern microscopes are compound instead of simple.
C) Modern microscopes have lenses with smaller numerical apertures.
D) Modern lenses are made of prisms.
E) Modern microscopes are compound and have fivefold better resolution.
E
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In which paleoanthropological site do we find the largest single group of ancient Homo fossils (approximately 30 individuals)?
Which cell type is unique to vertebrates, and distinct from endoderm, mesoderm, and ectoderm?
a. pharyngeal b. neural crest c. oral hood d. notochordal e. cranial
Which component of the muscle stretch reflex initiates the reflex?
a. motor neuron b. interneuron c. muscle spindle d. acetylcholine e. Schwann cell
What likely caused the slight increase of mean poison ivy biomass in the control plots?
A) random experimental error
B) an increase in atmospheric CO2 levels
C) There were more poison ivy plants in the control plots to begin with.