How long does cyclin production last during a typical cell cycle in embryonic clam cells

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

Diagram of the evolution of land plants?

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?