The European green crab is an invasive species that has recently entered inland waters of Washington Once established, this crab can disrupt the natural ecosystem by outcompeting native species for food and habitat. A biologist is collecting data from local salt marshes and estuaries to evaluate the impact of the invasive crab on the populations of native organisms that live there. Which
experimental design will most efficiently provide accurate, reliable data for evidence?

Maria wanted to grow a fern in her backyard. acting on a suggestion from a friend, she collected brown dots from the underside of a fern's leaves and then potted them. after a few days, maria saw small fern leaves erupting from the pot. which statement explains this phenomenon? a. the fern transitioned from gametophyte generation to sporophyte generation. b. the fern grew as a result of mitosis. c. the fern transitioned from sporophyte generation to gametophyte generation. d. the fern grew to be genetically identical to its parent plant.

Can bacteria reproduce in a way such that when you start out with two bacteria, you get five bacteria? why or why not? * a. yes, because bacteria reproduce sexually, and can produce any number of offspring, just as humans do. b. no, because bacteria grow at an exponential rate. c. no, because when bacteria reproduce, they split into two parts, and two bacteria splitting would result in four bacteria.

Ascientific idea becomes valid when it is what?