Kangaroos are mammals that lack a placenta. therefore, they must have an alternate way of supplying the developing embryo with

a. carbon dioxide
b. enzymes
c. nutrients

Abiologist counts the number of rabbits in a population each year and observes a decrease in population. since the coyote population has exploded, the biologist concludes that the coyote population has had a negative interaction with the rabbit population. which describes the biologist’s actions? a.) experimentationb.) inferencec.) observationd.) interacting