- Calculate the efficiency of energy transfer from primary consumers to secondary consumers.

only 10% of the energy gets passed down the food chain each time

Explanation:

the primary consumer would use 90% of the energy from the plants

each time a transfer of energy occurs it loses 90% percent of the energy

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?