To prevent acid from seeping in the stomach, the stomach cells join one another via

lichens that colonize bare rock secrete acids that break down the rock and start the soil-production process. so they expose rocks

1. glacier movement over the crust.

2. upwelling from the water table.

3. formation of a terminal moraine

explanation:

lakes can be formed as a result of these three options.

when charles darwin published  the origin of species  150  years ago he consciously avoided discussing the origin of life. however, analysis of some other texts written by darwin, and of the correspondence he exchanged with friends and colleagues demonstrates that he took for granted the possibility of a natural emergence of the first life forms. as shown by notes from the pages he excised from his private notebooks, as early as 1837 darwin was convinced that “the intimate relation of life with laws of chemical combination, & the universality of latter render spontaneous generation not improbable”. like many of his contemporaries, darwin rejected the idea that putrefaction of preexisting organic compounds could lead to the appearance of organisms. although he favored the possibility that life could appear by natural processes from simple inorganic compounds, his reluctance to discuss the issue resulted from his recognition that at the time it was possible to undertake the experimental study of the emergence of life.