Hey there what is your question?
The controlled experiments are performed by the scientists, when they want to study the changes in the sample on changing a single variable. So, the correct answer is option (b).
In case, all variables are kept same, no changes would be observed in the experiment sample. A controlled experiment can be performed on living thing as well as non living. But, controlled experiment cannot be performed on the things which are influenced by a lot of variables, as they cannot create realistic results. So, the option (a), (c), and (d) are incorrect.
A gamete of this organism will have half that number (50), the haploid number of 25 chromosomes.
Actually depends on the species. Take snakes for example. They quickly thrived here in america because they had similar environements over in europe. The warm climate here in florida is perfect for them. They like the heat of the sun the dense foliage and many other good qualities here. Also their are other places that are good as long as they are hot have water and prey and a nice hole they can sleep in they can survive making them very adaptable.
