What characteristic of most of the tropical open oceans is directly responsible for the oligotrophic nature of these waters? what characteristic of most of the tropical open oceans is directly responsible for the oligotrophic nature of these waters? low chlorophyll concentrations increased scattering of blue light abundant sunlight frequent upwelling low nutrient concentrations?

For the strategies below, decide whether they are best described as demand-side solutions or supply-side solutions to meeting human needs for fresh water. remember that a demand-side solution reduces demand for fresh water, whereas a supply-side solution increases the supply of fresh water. (a) damming a river to create a reservoir (b) desalinating seawater (c) a nation invading a neighboring country to access their rivers (d) raising water prices for consumers and businesses (e) providing tax breaks for companies that use less water (f) replacing inefficient irrigation with more-efficient drip irrigation to grow crops (g) requiring low-flow showerheads in all new homes

The diagram shows a chicken embryo and a human embryo

Which is an example of a vestigial structure? a: paw of a lionb: wing of a birdc: appendix of a humand: tail of a cat(i think it's a but i'm not sure)