The student wore safety glasses and placed the cubes in a beaker of red dye solution for five minutes. He then poured the solution
into another beaker, washed the surface of the cubes and dried
them with blotting paper. He then cut each cube in half and
examined the newly cut surfaces. In which cube would the dye
penetrate more and why?

Which kind of aquatic ecosystem does the photograph most likely show? a. marsh b. swamp c. lake d. river

Each trait of a plant is determined a. an allele b. one gene c. a pair of genes d. one dominant gene

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.