Which is an example of a scientist using a physical model to describe a river?

A. The scientist builds a model of the river using plastic and a hose.

B. The scientist thinks of the river like a flow of electrons.

C. The scientist uses a computer to predict how much water will
flow.

D. The scientist writes an equation that describes the flooding of the
river.

2positives of biotechnology: 1. plants have become more resistant to viruses and other communicable pests.2. with the of biotechnology, we have been able to produce better tasting fruits as well as vegetables.2 negatives of biotechnology: 1. biotechnology poses a number of environmental threats. genetically modifies crops often infect monarch butterflies and other insect species.2. viruses could combine with crops.