Some complex multicellular organisms are organized at four levels to increase efficiency. what is the correct order of organization, from the simplest to the most complex?
a. organ, tissue, cell, organ system
b. cell, organ, organ system, tissue
c. tissue, cell, organ system, organ
d. cell, tissue, organ, organ system

How does the nervous system affect the excretory system?

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?

For the strategies below, decide whether they are best described as demand-side solutions or supply-side solutions to meeting human needs for fresh water. remember that a demand-side solution reduces demand for fresh water, whereas a supply-side solution increases the supply of fresh water. (a) damming a river to create a reservoir (b) desalinating seawater (c) a nation invading a neighboring country to access their rivers (d) raising water prices for consumers and businesses (e) providing tax breaks for companies that use less water (f) replacing inefficient irrigation with more-efficient drip irrigation to grow crops (g) requiring low-flow showerheads in all new homes