Which of the following statements is true?
1.both unicellular and multicellular organisms are at risk of having too much water entering their cells if they are exposed to water containing no salts.
2.only multicellular organisms have structures that enable them to regulate excess water entering their cells.
3.unicellular organisms can protect themselves against too much water uptake by closing their membrane channels that allow water transport.
4.unicellular organisms, but not multicellular organisms, must deal with the movement of water by osmosis across their cell membranes

What was the purpose of mendel's experiments with dihybrid crosses? a. to determine if dna was a transforming factor b. to determine if traits could be recessive c. to determine if traits affected each other d. to determine if traits had more than one allele

An area has a few days of low humidity, warm air temperature, and high air pressure. what kind of weather is this area experiencing? o fog o snow storms o sun

Even though the ostrich is a flightless bird, ostriches still possess wings that stretch approximately two meters across when fully extended. scientists speculate that when dinosaurs became extinct, some of the birds that lived during that time became land dwellers since they were able to consume the food that the dinosaurs once ate. over time, these species grew larger and heavier. eventually, the ostrich species became too big to fly. the wings found on ostriches are known as a. analogous structures. b. homologous structures. c. vestigial structures. d. symmetrical structures.