What is the purpose of colorful petals? A. To attract insects

B. So pollen grains stand out

C. So birds avoid eating the plant

During endocytosis, cells expel what they don't need take in what they need shrink due to loss of water

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs

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.