5. Blood cells, which are part of the circulatory system, or created by marrow. This demonstrates that the circulatory system interacts with which of the following systems? A respiratory B skeletal C excretory D integumentary

The response is the basis for vaccination. primary secondary tertiary none of the above

Ascientist is designing an investigation to study the impact of invasive bird populations on local, native bird populations at backyard bird feeders. what population is most likely to be a control group for the investigation? amount of food number of bird feeders invasive bird populations local backyard birdfeeders without food

The source of energy shown in the image is (renewable, non renewable, polluting) a drawback of building a dam is that (it will destroy ecosystems, it requires fossil fuels, it won’t be useful for irrigation)