In which system do red blood cells carry oxygen from the lungs to the cells and then carry carbon dioxide back to the lungs to be exhaled?

An experiment was designed to investigate the effect of caffeine on the rate of heartbeat of fruit flies. Two populations of fruit flies were grown in a lab. Both populations were raised drinking the same water and the same type of food.

What is the function of cilia

Which are causes of mechanical weathering? Select three options. A) acid rain B) plant growth C) animal actions D) carbon dioxide E) pressure release

What are biodversity hot spots?

What is the single most important step in doing a venipuncture?

Which characteristic makes fungi similar to plants? Both fungi and plants are autotrophic organisms. Both fungi and plants have vascular tissue. Both fungi and plants have cell walls of chitin. Both fungi and plants can grow in soil.

How do plants atrract flies or possums for pollination

Suppose a bolt of lightning starts a fire in a forest. The fire sweeps through the forest and burns away accumulations of brush and deadwood. What is the most likely effect of the fire on the forest community?

What impact does 2-d diversity have on a company?

How can acid rain affect biodiversity in a pond?