Please I'm taking the unit test I need help Which process is defined as breaking down rocks into smaller pieces without changing the rocks' compositions?

erosion
oxidation
chemical weathering
mechanical weathering

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.

What record? the question is incomplete