Carlos is conducting a controlled experiment. A controlled experiment is a scientific test where only one variable is changed and there is a group of subjects (named the control group) that is not receiving the factor that is being tested. The group of subjects receiving a treatment or the factor which is being tested is called the experimental group. The variable which is different between the control and the experimental group is the independent variable. The dependent variable depends on the independent variable and represents the response that we observe as an outcome of our experiment.
Answer:
D
Explanation:
Natural selection is the differential survival and reproduction of individuals because of the differences in the phenotypic characteristics. It supports the fact that those organisms, which have phenotypic characteristic favorable to survive in the changing environment as compared to other organisms, and these traits will also be passed to the successive generations.
In the given situation, the hummingbirds those have adapted according to the needs, that is deriving nectar from either from short and long tubes nectar. Therefore, two phenotypic characteristics like short beak and long beaks will become dominant trait in the population of humingbirds as the intermediate beak hummingbirds will not be able to feed from either of the flowers.
<h2>Pls, Branliest!</h2>
Density...
Fire bricks absorb many btu’s, so once heated up only a small flame is required to maintain that heat/temperature.
The fire brick composition is mostly materials like alumina silica sand, clay, not very porous.
Aphotic zone of a body of water refers to the part where almost no sunlight. With this condition of water, marine life is limited to species who does not light for survival. The aphotic area also is the basin of the dead organism that submerges from the photic part. Temperatures at these areas are also low.
