Which of the following statements best summarises evolution as it is viewed today?

You are confronted with a box of preserved grasshoppers of various species that are new to science and have not been described. Your assignment is to separate them into species. There is no accompanying information as to where or when they were collected. Which species concept will you have to use?

While surveying plants in Madagascar, you come across a flowering plant that you have never seen before. You examine one of the flowers closely and you see that it has bilateral symmetry, has organs arranged in a whorled phyllotaxy and it has four stamens. Based on your knowledge of flowering plant lineages you conclude that

What is a major challenge for photosynthetic organisms on land compared to water?