Which of the following is the best description of an adaptation?
a.
a trait that was beneficial to survival in the past
b.
a trait that is of no advantage to survival
c.
a trait that will be beneficial in the future
d.
an environmental change that selects for certain traits
e.
a trait that is currently beneficial to survival

Which statement best explains why cells were observed in more detail using a compound microscope than a simple microscope? a compound microscope has greater magnification ability than a simple microscope. the compound microscope was invented before the simple microscope. a compound microscope is much easier to manufacture than a simple microscope. compound microscopes were more common than simple microscopes.