Which example is a representation of the amount of chemical energy at each trophic level?

A. joule

B. primary productivity

C. energy pyramid

D. food chain

What is one piece of evidence for the endosymbiotic origin of eukaryotic organelles

When do scientists believe life originated on Earth? A. 3 to 4 billion years ago B. 600 million years ago C. less than 6,000 years ago D. over 5 billion years ago

Identify the cerebellum, cervical plexus, brachial plexus, posterior rootlets, and posterior median sulcus.

In order to understand the specific function of the ossicles, scientists removed both the tympanic membrane and the ossicles from the auditory canal of a rodent, allowing sound waves to directly influence depolarization of stereovilli.

A skateboarder falls and lands directly on his buttocks and lower back. He does not feel too much pain and so he continues skating.

Which two inner planets have water in the form of ice?

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