Why is it difficult to construct a practical calendar based on the moons cycle of phase

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.

No. an alpha particle is a pair of protons and a pair of neutrons, i.e. a helium