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Group 17, called the halogens, have seven electrons in their valence shell and need one electron to complete the shell.
Which of the following describes the muscular organ that processes food material into increasingly smaller pieces, mixes it with saliva to create a bolus, and creates a barrier to transport food into the esophagus?
The process of organisms with an advantageous trait surviving more often and producing more offspring than organisms without the advantageous trait describes which of the following basic mechanisms of evolution?
A polar molecule always has
A covalent bond.
What type of bones make up the wrist and the foot?
During photosynthesis, which two compounds are combined to create the output of glucose and oxygen?
Carbon dioxide and water.
The number of protons is the same as?
The atomic number.
The identity of an element is determined by its number of
A scientist designs an experiment to test the hypothesis that exposure to more sunlight will increase the growth rate of elodea, a type of aquatic plant. The scientist has accumulated data from previous experiments that identify the average growth rate of elodea exposed to natural sunlight in the wild.
In the experiment setup, there are three tanks housing ten elodea each. Tank A is positioned in front of a window to receive natural sunlight similar to what elodea are exposed to; tank B is positioned in front of the same window but has an additional sunlight-replicating lamp affixed to it; and tank C is positioned in a dark corner with no exposure to natural sunlight.
When setting up the above experiment, the scientist has the option of using a separate water filter for each of the three tanks or using a single filtration system that attaches to all three and affects them simultaneously. Which of the following filter setups makes a more valid experiment and why?
One filtration system for all three tanks, because this makes filtration a controlled variable.
Which of the following BEST explains how inhalation occurs in the human respiratory system?
The diaphragm contracts and lowers, making the air pressure in the lungs decrease.
Which of the following prefixes would likely be the most appropriate for measuring the weight of a 2,500 g kitten?
What substance does a Schwann cell secrete that increases the speed of signals traveling to and from neurons?
Within the nucleus, DNA is tightly wound around histones. How does this arrangement regulate gene transcription?
Enzymes are only able to reach regions of DNA where the chromatin has unwound.
What is the term for the region of the body that lies below the ribcage and above the pelvis?
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