Why can a tRNA molecule only carry 1 specific amino acid?

In the family tree below, people with the recessive trait of attached earlobes are shaded gray.

Name one similarity and one difference between the morphology of a brachiopod and a bivalve

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