Chum salmon (Oncorhynchus keta) are born in freshwater environments and then migrate to the sea Near the end of their lives, the
y return to the freshwater stream where they were born to spawn. In freshwater, water constantly diffuses into the body and ions are lost from the body. In salt water, body water diffuses out of the body and excess ions are gained from the water. A salmon's gills have special cells to pump salt in or out of the body to maintain homeostasis. IN response to the salmon's moves between freshwater and salt water, some cells in the gills are produced and others are destroyed. These changes made in the cells of the gills during the lifetime of an individual salmon are an example of ... ? a. Trade off
b. Evolution
c. Acclimatization
d. Adaptation
Acclimatization is the process in which an individual adjusted itself in order to respond adequately to a change in its environmentm- in this case, the change from sea water to freshwater- and maintain good performance. Acclimatization occurs in a short period of time and <em>within the organism's </em><em>lifetime </em><em>. </em>This last part is an important difference between acclimatization and adaptation, becasue an adaptation is a change that has taken place over many generations.
The agent that kills bacteria is called bactericidal. Bactericidal agents act directly by destroying the present bacteria. It is also different from bacteriostatic, because bacteriostatic means the inhibition of the spread and growth of bacteria only.
In the early stages the embryos of four different species will look the same .For example, fish embryos and human embryos both have gill slits. In fish they develop into gills, but in humans they disappear before birth. That what makes them different.
When a muscle contracts, the actin is pulled along myosin toward the center of the sarcomere until the actin and myosin filaments are completely overlapped.
