#B3.4.1
explain how some abiotic and biotic factors affect communities, including environmental conditions, toxic chemicals, availability of food and other resources, and the presence of predators and pathogens
#B3.4.2
describe how to carry out a field investigation into the distribution and abundance of organisms in an ecosystem and explain how to determine their numbers in a given area
PAG3
#B3.4.3
the context of data related to organisms within a population:
a) calculate arithmetic means
b) use fractions and percentages
c) plot and draw appropriate graphs selecting appropriate scales for the axes
d) extract and interpret information from charts, graphs and tables