Why are polar bears listed as threatened species?

a. the ice they hunt from is melting
b. their numbers are rapidly declining
c. their prey is dying off
d. invasive species are hurting them

Match each description to the appropriate biome. tropical savanna desert tropical rain forest taiga tundra has sparse vegetation and very cold temperatures located near the equator and contains trees that form dense canopy layers is very hot and dry, and has plants that need little water has cold winters, heavy snowfall and is dominated by conifers has warm temperatures and is dominated by grasses

Mitosis creates two identical daughter cells from one parent cell creates four nonidentical daughter cells from one parent cell is the most common type of reproduction for bacteria is the process by which male and female reproductive cells are created

Why are some places regularly warmer or cooler than others in a given month