When moving upward on an energy pyramid from one level to the next, what happens to the usable energy in an

ecosystem?

It increases by about 10%

It increases by about 90%

It decreases by about 10%

It decreases by about 90%

The spines and thick wavy cuticle on a cactus are both what

A 28.5 g iron shot is added to a graduated cylinder containing 45.5 ml of water. The water level rises to the 49.1 ml mark. Calculate the density of the iron shot.

Convert 44 centimeters to meters. A. 4 m B. 4.4 m C. 0.44 m D. 0.044 m

What is the chemical property of candels

Which of the following would increase the amount to dissolve a solid solute?

Which of the following is a part of a land based carbon cycle? coral reefs Crab shells Trees Whales

What is common of volcanoes that have the most violent eruptions? A. They feature magma with very high silica content. B. They are shield volcanoes. C. They feature magma with low viscosity. D. They have no magma, but have much lava.

Why is nitrogen fixation such an important step in the nitrogen cycle? Question 7 options: Bacteria convert the fixed nitrogen back into N2. Soil nitrogen is different. Decomposers need to use NH4+. Plants can't use nitrogen in the form of N2.

At 400 K, the rate of decomposition of a gaseous compound initially at a pressure of 12.6 kPa, was 9.71 Pa s-1 when 10.0 per cent had reacted and 7.67 Pa s-1 when 20.0 percent had reacted. Determine the order of the reaction.

What particles are used to form bonds