Early Earth was constantly being bombarded by meteorites, comets, and asteroids.
Was early Earth an open system or a closed system?

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.

Ithink d hope that

13) a 14) a15) b16) i don't know sorry17) a (maybe)