All vertebrates have
a spinal column of bone and/or cartilage.

a spinal nerve chord.

a brain and paired sense organs.

all of the above

Which statement about the immune system is false? a. lymphocytes reduce inflammation, b. b cells remember specific pathogens. c. most white blood cells kill bacteria d. white blood cells are made in lymph nodes.

This comparative chart is an example of one that might be used by scientists and law enforcement personnel for identification purposes. the chart represents a technological advance called

Which tool could you see a plant cell? a. a filter b. a microscope c. a microwave d. an electromagnet