Are viruses alive? the scientific debate continues. viruses exhibit some characteristics of life, but others are missing. the most obvious reason why scientists still refer to viruses as non-living is that they a) do not change over time. b) do not contain any genetic material. c) are much smaller than anything alive. d) are not composed of one or more cells.

How do the sperm cells get from the stigma to the ovules?

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.

Veronica and her little sister, monique, are playing on a seesaw. if veronica weighs 75 pounds, and monique weighs 60 pounds, which statement is true?