Why do you think it can be difficult for scientists to determine whether an apparent relationship between species is an example of symbiosis? Use evidence from the article to support your answer.

The nature of the relationship isn’t always clear. For example, dolphins help people fish, but it’s not clear whether the dolphins respond to calls. This situation can make it difficult to determine whether the relationship is mutualistic or commensal.

plato

Explanation:

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

i believe it is c: genes for body color and wing size are inherited separately from each parent.