Absorptive cells- Form the walls of the intestines
epithelial cells- Form skin, body cavities, and some organs
Secretory cells- Glands (Sweat)
Nerve cells- Form the nervous system
Sensory cells- Conveys sensory information to the brain (light, smell, taste, ect.)
Muscle cells- Form muscles (body and organs)
Reproductive cells- Allow for reproduction or furthering of the species
Answer:
Principles of Geology
Explanation:
J. Henslow gifted Darwin the first volume of Principles of Geology, written by Charles Lyell. The book explains about the old age of the earth. Accordingly, the slow rate of several geological processes suggests that the earth is very old.
Darwin read the book as the ship was crossing the Atlantic and learned about geological processes occurring over the millions of years. For example, he learned that the earth's surface was not formed by some catastrophic event.
In his book, Lyell explained the slow and gradual geological processes like erosion gave rise to the vast landscapes present on the earth's surface.
Darwin compared the time taken by geological processes to form the earth's surface and reasoned if these millions of years were enough to support the evolution of species.
By making his research available to the public
