Match the following vocabulary words. 1. thin tissue covering lungs and thorax
alveoli
2. breathing in
pleura
3. air sacs in the lungs
inspiration
4. back of the mouth
expiration
5. "chest area"
pharynx
6. breathing out
thorax

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

Which statements describe resources? one of the factors people use when deciding where they will live is the availability of resources. renewable resources have little value for people. resources are unevenly distributed throughout the world. energy is the world resource which has the highest use. the use of nonrenewable resources has decreased in recent history. the use of resources is evenly distributed throughout the world. the world's oil supply will last for the next forty years if its use continues as expected.