Which of these exhibits a dorsal nerve chord at some stages of its development?

a. a grasshopper
b. a snail
c. a jellyfish
d. a lancelet

plz

If the birth rate of a population of dolphins is 2.0, the death rate is 0.5, and the population size is 100, what is this dolphin's population growth?

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

In what layer of the sun is energy transfers between atoms