1. An experiment was carried out to determine whether drinking caffeinated soda increases pulse rate. The pulse rates of two groups of people at rest were

measured. Group A was then given caffeinated soda and group B was given

caffeine-free soda. One hour after drinking the soda, the pulse rates were

measured

Independent variable:

Dependent Variable:

The independent variable is whether The dependent variable is the two groups

drinking caffeinated soda ncreases pulse of people at rest

rate

the answer is c) an oak tree

the glands which are associated with each description is given below:

the answer is c. altitude. hope this ! #brainiac

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.