When it comes to global issues, the environment often comes in second in concern to which of the following? troubled economy
population growth
lack of resources
prevalence of poverty

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Match the following items 1. rr 2. rr 3. identical alleles 4. unlike alleles 5. rr ()homozygous, recessive ()homozygous definition ()heterozygous, dominant cell ()heterozygous definition () homozygous, dominant cell