United States botanist who specialized in North American flora and who was an early supporter of Darwin's theories of evolution (1810-1888) | a biologist specializing in the study of plants |
American navigator who twice circumnavigated the globe and who discovered the Columbia River (1755-1806) | |
English poet best known for his elegy written in a country churchyard (1716-1771) | |
English radiobiologist in whose honor the gray (the SI unit of energy for the absorbed dose of radiation) was named (1905-1965) | |