A chemistry experiment is performed to determine the effect of a nonvolatile solute on the boiling point of water. Three trials are performed in which 10 mg, 20 mg, and 30 mg of salt are added to 500 mL of distilled water. Each solution is heated on a hot plate, and the elevated boiling points are recorded. Determine the dependent and independent variables in this question.

A. Hair

B. Nails

C. Skin

D. Iris

While melanin can be found in nails, it is not produced there. Melanin is the pigment that provides color to skin, hair, and eyes. Although the specific coloring of one's skin, hair, and eyes are genetically determined. environmental factors such as sun exposure can increase melanin production in the skin to help protect it from damage.

A. Phenotype

B. Species

C. Phylum

D. Genotype

Phenotype is the physical presentation of an organism's genes. In other words, the phenotype is the physical characteristics of the organism. Phenotype is often contrasted with genotype, the genetic makeup of an organism. The genotype of the organism is not visible in its presentation, although some of the characteristics encoded in the genes have to do with physical presentation. A phylum is a group of classes that are closely related. A species is a group of like organisms that are capable of breeding together and producing similar offspring.

A. Medial collateral ligament

B. Patella

C. Lateral malleolus

D. Lateral meniscus

The term "lateral malleolus" refers to the bony prominence on the outer side of the ankle.

It is part of the ankle joint, not the knee joint. The other options, such as the medial collateral ligament, patella, and lateral meniscus, are all associated with the knee joint.

A. An organelle is a specialized structure in a cell, such as a ribosome.

B. An organ is made up of similar tissues that perform the same function.

C. Organ systems are two or more organs performing similar functions.

D. A tissue contains a single cell type that works to perform a specific function.

A tissue contains a variety of cell types that work in conjunction to perform similar functions.

The cells are similar in structure despite being located throughout the body. There are four types of tissues in the human body: connective, epithelial, muscle, and nervous system tissues.

A. There were not enough age groups to show a trend based on age.

B. The addresses were chosen randomly rather than strategically

C. The distribution of ages in the sample did not reflect the actual population

D. Each response represents only one person per address

While the random selection and large number of surveys sent out were a good start, to truly study the relationship between age and screen usage, it would have been better to have a few more age groups or just a direct age value from each participant rather than four large categories. As far as whether the age distribution accurately reflected the population, we don't have enough information to say if that was a problem or not. Also, the fact that each response is from just one person at the address is not a flaw but a reasonable way to get a good variety of responses

A. ASD may be lethal.

B. ASD may be genetic.

C. ASD is related to traditional nuclear family structures,

D. No conclusion can be drawn based on this evidence.

The evidence says that every child in a certain family has been diagnosed with autism spectrum disorder (ASD). All of these children have genetic commonalities. Therefore, ASD may be genetic.

The evidence does not mention whether the children died from ASD. Therefore, no conclusion can be drawn that ASD may be lethal. Furthermore, the sample size of the evidence is much too small to suggest that ASD is related to traditional nuclear family structures.

A. Dally screen usage in the United States decreases with age

B. Daily screen usage in the United States, increases with age.

C. In the United States, most people use screens more than 3 but less than13 hours a day

D. In the United States, people over 75 generally don't use screens.

The percentage of respondents that indicated average screen usage between 4-12 hours per day is (628 +650+389) ÷ 2, 307 ≈ 0.723 or 72.3% This is indeed a significant majority of the responses and would be a reasonable conclusion. The highest screen usage is in the middle two groups with both the younger and older groups indicating less screen usage, so the daily usage neither increases nor decreases with age. While the oldest group shows the least usage per day, the survey data indicates that some of the Individuals over 75 do indeed use screens.

A. Vaporizing, then melting

B. Melting, then freezing

C. Vaporizing, then freezing

D. Melting, then vaporizing

A solid turns into a liquid by melting, and a liquid turns into gas by vaporization.

A. Increasing heart rate when blood pressure is low, Consuming excess calories to gain weight

B. Lifting weights to increase muscle mass

C. Shivering when the body temperature falls

D. Shivering when the body temperature falls, Secreting insulin to decrease blood sugar concentration, Increasing heart rate when blood pressure is low

Homeostatic mechanisms are involuntary actions by organs, glands, tissues and cells to maintain balance within the body. For example, if a person becomes dehydrated, the kidneys will retain fluid by decreasing urine output.

Consuming excess calories and lifting weights are not involuntary actions, nor do they maintain the body in its baseline state. Rather, they are actions specifically taken to move the body away from its baseline.

A. Independent variable

B. Dependent variable

C. Trial

D. Hypothesis

A hypothesis is the use of prior knowledge in order to provide a hypothetical explanation for why something may or may not occur. A hypothesis can be proved wrong or right based on the results of the experiment and repeated trials.