Aflea feeds off the blood of a dog. the flea is able to obtain nutrients from the blood, but the dog can become anemic. what type of relationship is this? a. commensalism b. predator-prey c. mutualism d. parasitism

Apopulation of black bears depends on salmon from a stream for food. if a drought causes the stream to run dry one year, how will this likely impact the black bear population?

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that

Below, the levels of organization in a multicellular organism are shown from least to most complex. which level of organization can be described as several different types of tissues working together to perform a common task?