They breathe through their skin. Air dissolves on the mucus of their skin, so they MUST stay moist to breathe.
If worms dry out, they suffocate. As fresh air is taken in through the skin, oxygen is drawn into the worm's circulatory system, and the worm's hearts pump the oxygenated blood to the head area.
The dependent variable is the variable which can be manipulated and can affect the independent variable. The dependent variable is on the x-axis while the independent variable is placed on the y-axis. In this case, the x-axis is the number of weeks while the y-axis is the height of the plant.
The Human Brain Versus The Computer. Computers are said to work much like the human brain in that both systems access and configure information in stages. First, input is received, next the input is processed, then the information is stored to memory, it is then configured, and lastly output is created.
He first divided all living organisms in 2 groups
Animal or Plant
He then put these into subgroups
Animal subgroups: land, water, air
Plant subgroups, small medium or large
Not a very specific approach to taxonomy but it was used for well over 100 years
a specialized cell, group of cells, or organ of endothelial origin that selectively removes materials from the blood, concentrates or alters them, and secretes them for further use in the body or for elimination from the body — compare endocrine gland, exocrine gland.
