A food web shows feeding relationships in an ecosystem. Alternative Text

In this food web, what is represented by the chains of arrows from the grass to the fox?

A. the one-way flow of energy through the ecosystem
B. the one-way flow of matter through the ecosystem
C. the conservation of energy in the ecosystem
D. the removal of energy from the ecosystem

Which plains area lies in both the united states and canada? altiplano central canadian shield coastal plains great plains

Which of the following scenarios is an example of the bottleneck effect? answers a in south africa, much of the afrikaner population is descended from a small number of dutch colonists. in this population, this is an unusually high frequency of pseudoxanthoma elasticum (pxe), an elastic tissue disorder. b four white-tailed deer are introduced to a park in finland. thirty years after their introduction scientists compare the genes in the population and find that there is no variation. c during the industrial revolution, london's air became filled with soot. as a result, birds started eating more of the lighter moths because they were easier to spot than their darker counterparts. over time, the moth population changed so that there were more darker moths than lighter ones. d 10% of the population of american alligators in an area have the recessive trait albinism. a massive flood results in the death of 80% of the population. of the remaining population, 60% have the recessive trait of albinism.

Which best describes the digestive system of arthropods? a incomplete, two openings b complete, one opening c two-way, one opening d one-way, two openings