Vaccines are produced from weakened or killed 1. red blood cells
2. pathogens.
3. antibodies
4. white blood cells

Although animals share many common characteristics, there is also a great amount of diversity found in animals. which animals are ectothermic, obtain dissolved oxygen in water through gills, have scales, have fins, and live in water?

If you see someone who is injured at a workplace, the first thing you should do is a. call 9-1-1 or your local emergency number b. begin to administer first aid c. check the scene for danger d. try to discover what is wrong with the person select the best answer from the choices provided a b c d

Viruses can cause the following, check all that apply. a. sore throat b. measles c. ear infection d. flu e. chicken pox