Cephalization describes the process by which organisms develop a distinct head. The head of a cephalized organism contains a concentrated group of nerves, or brain, that controls the rest of the organism, as well as specialized organs for consumption and perception, like mouths, eyes and ears. Cephalized organisms exhibit a distinct division between parts of the body; they have a front, back, top and bottom. These animals comprise the bulk of animals that are encountered on a daily basis.
sea star following organisms exhibits cephalization
Explanation:
<u>the Paleozoic Era </u>
The Precambrian era describes a period of time that pre-dates Cambrian. This time typically references the entire period of the history of earth before the formation of rocks containing identifiable fossils occurred. It covers the majority of Earth’s history and is divided into the Hadean, Archean and the Proterozoic era.
Just before the Cambrian eruption, in the Paleozoic Era the environment was oxygenated, culminating in an explosion of new life in the Proteozoic Eon (2500-541 million years ago) in the form of primitive blue-green algae named cyanobacteria and oxygen based species. Multicellular species followed later, along with structure at higher levels, and complex life. Oxygen levels grew gradually over this period of time, from low levels.
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Answer:
<em>In order to reach equilibrium, water will move outside the cell to reach equilibrium. </em>A cell tends to lose or gain water in order to reach equilibrium.
If there are more number of solutes outside the cell, then the water will move out of the cell in order to maintain equilibrium. On the other hand, if there are more number of solutes inside the cell then the water will move inside the cell to maintain equilibrium.
<span>Cardiovascular exercise is important, after a prolonged break in physical activity, it is recommended to do between 30 and 45 minutes of moderate cardiovascular activity, between three and five days a week. You can also alternate low and high density workouts every day. The important thing is to allow the trained muscles to recover.</span>
