A circle with radius of 9 cm sits inside a circle with radius of 11 cm.

What is the area of the shaded region?

Round your final answer to the nearest hundredth.

What should an ecologist measure in order to construct a pyramid of biomass for an ecosystem? A. the biomass in each trophic level of the food web B. the total mass of all the organisms in a representative area of the ecosystem C.

Which statements describe aspects of what causes wind to blow? Select two options. Wind is caused by differences in air pressure. Wind moves from low pressure areas to high pressure areas. Differences in air pressure are due to unequal heating.

How do photoautotrophs make energy? A. They convert carbon dioxide, water, and inorganic compounds into carbohydrates. B. They convert carbon dioxide, water, and organic molecules to carbohydrates. C.

Which of these correctly compares the masses of different objects in the universe? A] A moon has less mass than a star and more mass than the planet it orbits. B] A planet has less mass than a galaxy and more mass than the star it orbits.

What general part of the general circulation would you find the "doldrums"?

Inhibiting enzymes involved in cell wall synthesis leads to which of the following? A) cell death by osmotic lysisB) a reduction in protein synthesisC) the incomplete synthesis of the bacterial cell wallD) a reduction in the amount of usable energy

In the 20th century where did the most ecologically destructive oil spill in the US

Which of the activities listed below are functions of the Lymphatic System? 1 transports lipids to the blood 2 transports lipid-soluble vitamins to the blood 3 drains excess interstitial fluid from tissue spaces and returns it to the blood 4

Under which circumstances must facilitated diffusion be used instead of simple diffusion?

The biochemical analysis of different chlorophyll pigments in plants would be most useful in determining ... question 3 options: