What are the two main categories of ecosystems?

a.

effective and ineffective

b.

marine and freshwater

c.

biotic and abiotic

d.

aquatic and terrestrial

2. Which of the following will change the equilibrium potential for Na+? 1. the gating properties of the Na + channels 2. the concentration of the Na + on the inside of the cell versus the outside 3. the ion channels that are open in the cell 4.

Which physical evidence supports the evolution of Earth due to chemical weathering

How are pathogens trapped by and expelled from the respiratory system?

Why don't car buyers always choose fuel-efficient vehicles, and how can government regulations encourage them to do so?

Which word equation summarizes the hydrolysis of a carbohydrate

How are mosses and horsetails similar to ferns

Determine approximately how much total energy is lost from a three step food chain if 1000 calories enter at the autotroph level

Give two examples of equations for the synthesis of transuranium elements by transmutation

In muscle the source of a "phosphate molecule needed to recharge an adp molecule to an atp molecule" is

5. What would occur if ... a ... the wildflower population decreased?