Some barnacles derive nutrients from living on the flesh of whales. This does not cause significant pain to the whales. Which type of symbiotic relationship do these organisms have? Commensalism
Mutualism
Predation
parasitism

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

Groups of organisms with low biotic potential, such as gray whales, that produce at most one offspring every other year a) are r-selected b) are k-selected c) are not subject to density-dependent limiting factors d) show the initial stages of the extinction process e) have escaped from the processes of natural selection and adaptation

2points what is the term for a female reproductive cell? a. egg b. chromatid c. allele d. fertilization