Answer:
Weathering is very important to human life since it helps us to describe the formation of various landforms, leading to the formation of building materials like clay and the remnant of weathered rock like granitic tors can act as a tourist attraction.
Answer:
Due to small in size.
Explanation:
Some organelles such as nucleus, mitochondria and Golgi bodies can't be seen because they are too small in size and near to the limit of the microscope. Organelles present in plant cell are nucleus, mitochondria and Golgi, endoplasmic reticulum, ribosomes, one big vacuole, cell membrane and cell wall whereas organelles present in animal cell such as nucleus, mitochondria and Golgi bodies, endoplasmic reticulum, ribosomes, lysosomes, several small vacuoles and cell membrane. In animal cell centriole and lysosomes are present and absent in plant cell while in plant cell, cell wall and one large vacuole present in the center of the nucleus and these organelles are absent in animal cell. Plant and animal cells are eukaryotic because they have organelles and surrounded by membrane.
<span>The first two tenets of the Cell theory were postulated by Schleiden and Schwann at the first half of the 19th century. Those tenets are that "all organisms are composed of one or more cells" and that "the cell is the basic unit of life". In 1855, Rudolf Virchow added the third tenet "Omnis cellula e cellula" which means that "all cells come from cells". In other words, cells can be formed only in the division of other cells.</span>
