The appropriate answers are b. farming, c. deforestation and d. construction. Deforestation is the widespread removal of trees from forests. Deforestation destroys the habitats of thousands of species, especially regions such as the Amazon. Large scale construction can lead to the destruction of habitats as the original shape of the land is altered. This alteration almost always disrupts habitats. Improper farming techniques can lead to deforestation and soil erosion; both of which disrupts habitats.
Collar cells have a sticky funnel-shaped collar and a hair-like whip that is called the flagellum. A cell called an amebocyte takes the food picked up by a collar cell to other cells within the sponge. Collar cells are also called choanocytes
The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells. Rudolf Virchow later made important contributions to this theory.
