Use the drop-down menus and what you know about index fossils to choose the correct answers.
Index fossils are the remains of organisms that lived on Earth for
periods.
First, geologists use relative age to determine the of the layers of rock.
They then use index fossils to relate the layers to those in
locations.

The body is protected against harmful flu viruses by

Can bacteria reproduce in a way such that when you start out with two bacteria, you get five bacteria? why or why not? * a. yes, because bacteria reproduce sexually, and can produce any number of offspring, just as humans do. b. no, because bacteria grow at an exponential rate. c. no, because when bacteria reproduce, they split into two parts, and two bacteria splitting would result in four bacteria.

Which is not a type of symmetry? a. asymmetryb. radial symmetryc. bilateral symmetryd. lateral symmetry