The Arctic tundra has wetlands caused by .
A. glaciers that melted thousands of years ago
B. soil that is frozen solid all year
C. summer thaws combined with frozen permafrost
D. the overflow of a large lake each summer

Which group is noted for the independence of gametophyte and sporophyte generations from each other? a) ferns b) mosses, hornworts, and liverworts c) charophytes d) angiosperms e) gymnosperms

How many copies of each chromosomes should be present in each of the 4 final haploid versions of gamete?

Which of the following is a consequence of urban heat islands? increased precipitation downwind of the city? increased precipitation upwind of the city? decreased winds within the city? increased winds within the city?