A student argues that being separated geographically is the only way for speciation to occur. Why is he wrong? *Speciation does not usually rely on geographic isolation.
*Speciation can occur from biological forces as well.
*Speciation can occur from variation as well.
*Speciation does not result from adaptive radiation.

I have all the answers for the quiz (#4 is A)!

Fill in the blank 1. digestion occurs in the small intestine through the action of enzymes. 2. urea, excess water, and other waste materials are eliminated in a water fluid called 3. can cause infections by injecting dna or rna into hosts. 4. the human immune system produces in response to a vaccine, which later can bind to and destroy a pathogen if it invades. 5. are structures that link bone to bone at a joint 6. in the heart, blood flows from the right atrium to the right ventricle, where it is pumped to the the words i can use are: lymphocytes gliding pivot gas urine absorption dermis fulcrum lungs chemical viruses capillary vertebrae esophagus tendons antibodies synapses ligaments kidneys pathogens