Which describes how mRNA is used by a cell? A it is used to stop toxins from entering the nucleus
B it is used to prevent mutations in DNA
C it is used to transfer info to the ribosome
D it is used to replicate DNA for meiosis

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

Aheterozygous normal male marries a woman with a sickle cell anemia. give the genotypes and possible phenotypes of the offspring

Which direction does the energy flow in this energy pyramid ?