Students illustrate a flow-chart model of gene expression. How does genetic information flow in the cell? Complete the model by placing the labels into the boxes.
Genetic information is stored in DNA molecules.
Genetic information is used to assemble protein into DNA molecules.
Genetic information is carried by messenger molecules (RNA).
Genetic information is stored in protein molecules.
Genetic information is used to assemble amino acids into protein molecules.

Examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. examine the two squirrel populations in the accompanying figure. the populations are separated by a geographic barrier. if after a long period of time the two species are no longer separated, what evidence is needed to determine if speciation has occurred? the figure shows two populations of squirrels separated by a geographic barrier. polyploidy is creating new species. the two populations are not interbreeding freely. hybrid offspring of the two populations begin to appear. one species will increase into a population size twice as large as the other species.

What did hunter gathers do to alter the environment?

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