What do plants and animals need nitrogen for?

Based on the pyrmaid which type of organism would be less abudant in most ecosystems this is due to

Why is hypothermia used in an open heart surgery? A. to prevent organ rejection from the patient's immune system B. to artificially oxygenate blood by bypassing it through the lungs C.

Which of the following currents has a great impact on reshaping the shoreline? ebb current tidal current longshore current flood current

What do most sedimentary rocks form from?

Which of these is the best indication of the relative age of a rock layer

Which sentences describe star clusters?

Which of the following is an advantage of nuclear energy over fossil fuels? A. Eliminates the need for mining. B. Uses a renewable energy source. C. Releases less CO2 waste products. D. Releases more CO2 waste products.

A cell with 46 chromosomes inside itsnucleus goes through one round of mitosis and cytokinesis. How manychromosomes are inside each of the two resulting nuclei?

The theory that explains how the earths surface is made up of moving rocky plates is called: A. Supercontinent B. Plate tectonics C. Sea floor spreading D. Continental drift

10. Which of the following is an emerging dis- ease that was unknown 50 years ago? a. malaria b. dengue fever C. Lyme disease d. schistosomiasis