The red blood cell count is kept stable despite productions of new cells by what?
a: blood loss
b: cell divion
c: programmed cell death
d: cell differentiation

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?