1.Explain why estuanies are very productive ecosystems. 2. Why are estuaries vulnerable to the effects of pollution? Explain all of your answers. Do this in about 5 sentence.

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?

What is the correct term for an area of rotating currents in an ocean? when ocean currents combine, they create an area of rotating currents called an

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?