Which is the most common contamination source for freshwater resources?

Below, the levels of organization in a multicellular organism are shown from least to most complex. which level of organization can be described as several different types of tissues working together to perform a common task?

Freckles are a dominant trait in humans. both of the girls have the genotype ff for freckles. if either one marries a man with no freckles, what are the chances that their children will have freckles?

Which worm has eyespots that are used to detect light? a fluke b marine worm c planarian d tapeworm