"Collar cells" perform what function for sponges?
A) produce a body cavity
B) help the sponge move through water
C) create a current to pull water through pores
D) ingest food particles
E) anchor the sponge to a base
Answer: C
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What is it called when a demand for a new lifestyle leads to many speciation events from one founder species?
a. sympatric speciation b. allopatric speciation c. adaptive radiation d. convergent radiation
Mycorrhizae are a true symbiotic relationship between plants and fungi. What is the primary benefit to the plants?
a. protection from animals that would eat the plant b. additional moisture which protects plants from drought c. access to phosphorus that hyphae can obtain but plant roots cannot d. loosening and aerating the soil
What affects the rate of diffusion through a selectively permeable membrane?
I. concentration gradient II. temperature III. molecular size
a. I only b. II only c. I and II d. II and III e. I, II, and III
Although Americans make up less than 5% of the total human population, what percentage of the world's resources do Americans generally use?
A) 51% B) 24% C) 73% D) 82%