Zooplankton populations in Lake Erie and the Hudson River have declined by up to 70% since the arrival of zebra mussels because . Group of answer choices Zebra mussels feed on phytoplankton, which zooplankton need as a food source Zooplakton are reduced due to predator mediated competition Zebra mussels block sunlight penetration into lakes and thus prevent zooplankton from photosynthesizing Zebra mussels prey exclusively on zooplankton Zooplankton are replaced due to competitive exclusion

Which part of the cell is affected by the movement of molecules through diffusion, osmosis and active transport?

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?

Use this dichotomous key for insect identification to identify the insect shown. 1. a. insect has one pair of wings. order diptera b. insect has two pairs of wings. go to #2 2. a. front wings thicker in texture than hind wings go to #3. b. front and hind wings are same texture throughout. go to #4 3. a. front wings are short order dermaptera b. front wings cover entire abdomen order coleoptera 4. a. wings with scale on all parts of their area. order lepidoptera b. wings without scales go to #5. 5. a. hind wings smaller than front wings. order ephemeroptera b. front and hind wings nearly equal in size. order odonata the insect pictured is in the order diptera. ephemeroptera. coleoptera. odonata.