Primary succession is taking place. lichens are most often found on exposed rock and are the organisms responsible for initial soil and humus buildup. all but one is a feature of lichens that manage such a feat. a) can reproduce asexually b) can withstand conditions of low moisture c) can withstand high levels of air pollution d) symbiotic relationship with an algal species

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods.c. it shows that these organisms share the same habitat.d. it provides evidence that these organisms suffered a genetic mutation.