3. a scientist wants to test whether dogs are more attracted to the smell of chicken than the
smell of beef. which method, a controlled experiment, a scientific investigation or a
scientific model would be most useful to set up? why?

Hello!

a scientific model is used as a representation of an idea in order to explain certain phenomena.

A scientific investigation is a systematic process where a scientist tries to answer certain questions.

A controlled experiment is an experiment where scientists control the variables in order to observe the changes in the phenomena.

In this case, the scientists want to know if the dogs are more attracted to the smell of chicken or the smell of beef, then the first step is to make a controlled experiment in order to see the dogs and their preferences and collect data.

Then, when he already did the experiment, he can start analyzing the data and make a scientific investigation in order to create a scientific model that tells us how the dogs react to the smell of chicken and beef, for example.

Then the fundamental part is making the controlled experiment, in order to get the data.

there has been genes found in the x chromosome of males that have been linked to [homo/hetero]sexuality. in addition to the reign of the x chromosome, a section of chromosome 8 has also been link to, "alot of ppl are so " these facts were proven true after a 2014 study of a gay male and his strait brother. according to newscientist.com,"chromosome 14 and is mainly active in the thyroid, but also the brain. called tshr, it makes a type of receptor protein that recognises and binds to a hormone that stimulates the thyroid. in this way, the gene plays an important role in controlling thyroid function. the fact that tshr seems to be involved in sexual orientation fits with evidence that thyroid function seems to be linked to sexuality."

in conclusion, "ppl are so gay" due to their genetics.