•in an experiment the control is what the everything is compared to
->this allows the experimenter to determine what the effect of the variable is
•they repeat the tests to ensure precision and accuracy
•human error and inconsistencies effect results
->by repeating the tests they can assure that they have results as free from error as possible
Answer:
A gas.
Explanation:
Gas is highly flammable wand spreads rapidly if you pour a lot.
Answer:
Answered below.
Explanation:
During the absorption of glucose in the small intestinal lumen, the following processes occur.
Sodium ions inside the small intestinal cells are moved into the interstitial fluid and into the blood by the sodium-potassium pump.
The resulting low sodium in the intracellular environment creates a concentration gradient that triggers the transportation of sodium ions from the intestinal lumen into the small intestinal cells or enterocytes, by a mechanism called facilitated diffusion. Facilitated diffusion means diffusion facilitated by a transport protein. This transport protein, called the the sodium-glucose cotransporter, transports sodium alongside with glucose into the cells.
After glucose has been transported into the cell,it is then moved through the basal and lateral membranes into the blood by another transport protein called GLUT2.
Answer:
B) long-term smokers have poorer health than non-smokers
Explanation:
The complete question is given below:
Smoking causes accumulation of materials in the lungs, thereby decreasing oxygen-absorbing capability of the lungs. Long term smoking causes more accumulation of materials in the lungs. Decreased lung capacity increases the workload of the heart. Which of the following hypothesis can you make form these observations?
A) people who never smoke will never develop lung problems
B) long-term smokers have poorer health than non-smokers
C) new smokers have poorer heart health than long-term smokers
D) people who occasionally smoke will never develop heart problems
E) stopping smoking eliminates lung problems within 2 years
- A hypothesis is a prediction that is made by observing a few things, however there are no existing scientific proof.
- A hypothesis proposes an explanation for an observed phenomena which could further b proved or rejected by using scientific methods.
- In the question, the facts are given from which it can be observed that smoking leads to poor functioning of the lungs and this further leads to increase of the workload of the heart, this implies that smoking has a negative health effect.
- From these observations, <em>the hypothesis that can be made is long term smokers would have a poor health as compared to non smokers. </em>
Answer:
The correct option is D. All of the above.
Explanation:
known mutagens in today’s conventional diet includes:
1.)Nitrates and nitrites (N-nitrosamines), naturally occurring chemical compounds that are legal preservatives used to suppress harmful bacteria in a variety of cured meats and some cheeses.
2.)Polycyclic aromatic hydrocarbons (PAHs); food contamination by PAHs arises from processing of food (drying, smoking) and cooking of food at high temperatures (grilling, frying, roasting).
3.) Heterocyclic amines (HCAs), many of which are present in burnt and charred foods, especially blackened meat.