Question

question 7 of 10
a student made a model of a river in a sandbox. a pile of sand represents soil and bits of rock in the riverbed. water pouring from a hose represents river water as it flows downhill.
which two characteristics are limitations of the students model?
a. the model soil is nothing like the soil found in a real riverbed.
b. the model is missing plants, fish, and other details found in a real river.
c. the model river water flows downhill instead of uphill like real river water does.
d. the model is much smaller than a real river.

Explanation:

A real - river ecosystem has plants, fish and other living organisms which are missing in the model. Also, a real river is much larger in scale compared to the sandbox model. The model soil can be a representation of real - riverbed soil to some extent and river water naturally flows downhill.

Answer:

B. The model is missing plants, fish, and other details found in a real river.
D. The model is much smaller than a real river.