A reproductive difference between sea urchins and humans is
A) the sea urchin egg completes meiosis prior to fertilization, but meiosis in humans is completed after fertilization.
B) sea urchin eggs are produced by meiosis, but human eggs are produced by mitosis.
C) sea urchin eggs and sperm are of equal size, but human eggs are much bigger than human sperm.
D) sea urchins, but not humans, have a need to block polyspermy because only in sea urchins can there be more than one source of sperm to fertilize the eggs.
E) sea urchin zygotes get their mitochondria from the sperm but human zygotes get their mitochondria from the egg.
Over nearly 30 years, humans removed many polar bears for a variety of reasons, from a population in
Difference between Asian (left) and African (right) elephant ears.
Humans are one of the four extant hominid genera.
Anatomically modern humans left archaeological clues, including evidence of burials, which indicate
The development of the internal ducts of the male and female reproductive systems from the Wolffian ...
How to Factor a Difference of Squares