Answer the following question given this paragraph: The term evolution describes the changes that occur in populations of living organisms over time. Describing these changes does not address the origin of life. The two are commonly and mistakenly confused. Biological evolution likewise says nothing about cosmology, the Big Bang, or where the universe, galaxy, solar system, or Earth came from. Q: What process refers to the changes that occur in populations of living organisms over time? Choices: - spontaneous mutation - adaptation - variation - evolution A:
evolution
Answer the following question given this paragraph: Like the cells of all eukaryotes, animal cells have a nucleus and other membrane-bound organelles. Unlike the cells of eukaryotes in the Plant and Fungus Kingdoms, animal cells lack a cell wall. This gives animal cells flexibility. It lets them take on different shapes. This in turn allows them to become specialized for particular jobs. Q: Which kinds of cells have nuclei and other membrane bound organelles? Choices: - lipids - monocytes - prokaryotes - eukaryotes A:
eukaryotes
Q: Answer the following question given this paragraph: How high or low a sound seems to a listener is its pitch. Pitch, in turn, depends on the frequency of sound waves. Q: How high or low a sound seems is associated with what property of the sound? Choices: - decibel - frequency - wavelength - pitch A:
A: pitch
Question: Answer the following question given this paragraph: Q: Where does the heartbeat originate in vertebrates? Choices: - the tissue - the pulse - the blood - the heart A:
Answer: the heart
*Question*
Answer the following question given this paragraph: Friction occurs because no surface is perfectly smooth. Even surfaces that look smooth to the unaided eye make look rough or bumpy when viewed under a microscope. Look at the metal surfaces in the Figure below . The aluminum foil is so smooth that it's shiny. However, when highly magnified, the surface of metal appears to be very bumpy. All those mountains and valleys catch and grab the mountains and valleys of any other surface that contacts the metal. This creates friction. Q: The process of microscope mountains and valleys on the surface of a material interacting with another material is called? Choices: - tension - motion - vibration - friction A:
**Answer**
friction
Q: Answer the following question given this paragraph: Adipose Tissue Adipose tissue produces and secretes several hormones involved in lipid metabolism and storage. One important example is leptin, a protein manufactured by adipose cells that circulates in amounts directly proportional to levels of body fat. Leptin is released in response to food consumption and acts by binding to brain neurons involved in energy intake and expenditure. Binding of leptin produces a feeling of satiety after a meal, thereby reducing appetite. It also appears that the binding of leptin to brain receptors triggers the sympathetic nervous system to regulate bone metabolism, increasing deposition of cortical bone. Adiponectinanother hormone synthesized by adipose cellsappears to reduce cellular insulin resistance and to protect blood vessels from inflammation and atherosclerosis. Its levels are lower in people who are obese, and rise following weight loss. Q: What type of tissue produces and secretes several hormones involved in lipid metabolism and storage? Choices: - hormonal tissue - metabolism tissue - somatic tissue - adipose tissue A:
A: adipose tissue