Frequency of bowel movements varies widely among individuals, as well as varying widely for any single individual. In studies on the subject, approximately 50 to 70 percent of people surveyed report having a single daily bowel movement. Outliers range from one movement every three days to three movements a day.
Cell theory was eventually formulated in 1839. This is usually credited to Matthias Schleiden and Theodor Schwann. However, many other scientists like Rudolf Virchow contributed to the theory. The three tenets to the cell theory are as described below: All living organisms are composed of one or more cells.
Answer by Pambergn11. Confidence votes 44. An animal cell is made of a nucleus, a cell membrane, endoplasmic reticulum, mitochondrion, a nucleolus, Golgi bodies, ribosomes, lysosomes, and chromosomes. They are not that different from improved animal cells but different from human cells and improved human cells.nimal cells do not have cell walls, they only have cell membranes. The cell membrane mainly consists of a phospholipid bilayer, and also contains embedded proteins and choles â¦ terol. Plant cell walls are mainly made of cellulose, bacterial cell walls are mainly made of peptidoglycan.