A positively charged particle has great difficulty penetrating a target nucleus because the target nucleus has 1.a positive charge, which repels the particle
2.a negative charge, which attracts the particle
3.the protection of surrounding electrons
4.a very high binding energy

Based on the results of this study, what questions remain unanswered? how can these questions guide future research

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.

Ecology can best be described as the study of what