Homozygous means that it has the same alleles and lower case represents a recessive trait therefore the genotype for a homozygous recessive individual is: bb
Any property that is measurable, whose value describes a state of a physical system.
The correct answer is b: cattle on rangeland. A point source of pollution occurs from a single identifiable and usually spatially narrow source. These sources of pollution are usually relatively easily to quantify and manage. In contrast, a non-point source of pollution, such as cattle on rangeland or irrigated agriculture, is variable on both spatial and temporal scales. These sources of pollution are difficult to quantify and manage.
