Answer:
Independent variable: The fertilizer given
Dependent variable: Daily plant growth
Constants: How much water they receive daily, How much sunlight the plants receive, type of plant (tomato plant)
Explanation:
Independent variable of an experiment is the variable that is changed or manipulated by the experimenter in order to bring about a measurable response. In this experiment where Sherri wanted to test what fertilizer worked best on her tomato plants. She used 4 different brands of fertilizer. Hence, the FERTILIZER is the independent variable
On the other hand, the dependent variable is the variable that is measured in the experiment. It is the variable that responds to the independent variable. In this experiment, the DAILY PLANT GROWTH is the dependent variable.
Constants are variables that are kept unchanged or constant throughout the experiment. In this case, the constants or controlled variables are: : How much water they receive daily, How much sunlight the plants receive, type of plant (tomato plant)
The independent variable in Sherri's experiment is the type of fertilizer used. The dependent variable is the daily growth of the plants. The controlled variables include the type of plant, the amount of sunlight received, and the amount of water given daily.
In this experiment, the independent variable is the fertilizer given to each plant. This is because the type of fertilizer is what is being changed or manipulated in this experiment to observe the potential changes or effects on the plants.
The dependent variable in this scenario is the daily plant growth. It is called 'dependent' because its value might change depending on the effect of the independent variable (the fertilizer).
The controlled variables for the experiment are the type of plant, how much sunlight the plants receive, and how much water they receive daily. These are conditions that were kept the same for each plant to ensure that the only difference between the plants was the type of fertilizer used.
#SPJ3
the answer is D. it shows how the population changed because the shorter legged animals survived and continued the population while the long legged animals died away.
Natural selection occurs when there is variation within a species, inheritance of the variations, and a limit on resources. This leads to individuals with advantageous traits having a higher chance of survival and reproduction. The best example given was a population of mammals that evolved to have shorter legs due to a change in their habitat.
Natural selection is a crucial mechanism of evolution and it occurs when three conditions are present: variation within a species, inheritance of those variations, and a population limitation on resources consumed. This leads to a survival competition, where advantageous traits increase an individual's chances of survival and reproduction, thus passing these traits onto the offspring.
In the given options, the description that fits most closely with natural selection is: 'D. A population of mammals varies in the length of their legs, water levels rise and the habitat becomes swampy, the individuals with shorter legs are better able to swim to food, the population evolves to become shorter-legged'. This example demonstrates genetic variation (the different leg lengths), selection pressure (the change in habitat), and selection advantage (shorter legs being more suitable for the new conditions).
#SPJ3
During intense exertion or activity involving the muscles, there arises a need for a sudden short term burst of energy. This need for energy is so demanding that it cannot be satisfied through the normal mechanism whereby energy is supplied through aerobic respiration using oxygen.
Therefore the muscle cells must rely on other mechanisms that do not rely on oxygen to fuel muscle contraction and this is where they resort to anaerobic respiration which uses pyruvate to play the role of oxygen as the final electron acceptor. In the process, pyruvate accepts an electron and is reduced to lactic acid in the muscle tissues.
Answer:
Image result for How is cellular respiration, both anaerobic and aerobic
Cellular respiration can occur both aerobically (using oxygen), or anaerobically (without oxygen). During aerobic cellular respiration, glucose reacts with oxygen, forming ATP that can be used by the cell. Carbon dioxide and water are created as byproducts. In cellular respiration, glucose and oxygen react to form ATP.
Explanation:
INTERNET ;0
Answer:
In mammals, air enters lungs through tubes called bronchi, which branch into smaller tubules called bronchioles, which extend out to tiny air sacs called alveoli.
50% black : 50% grey
B.
100% black : 0% grey
C.
75% black : 25% grey
D.
25% black : 75
Answer:
B. 100% black : 0% grey
Explanation:
If allele for black fur (BB) is dominant over grey fur (bb) and the rabbits can have either of these two colors phenotypically then a cross between a homozygous black rabbit (BB) and heterozygous black rabbit (Bb) will produce all the rabbits with black phenotype.
The cross is shown as under :
Parental BB x Bb
F1 BB BB Bb Bb
Genotypic ratio => BB : Bb = 1:1 i.e. 50% homozygous dominants & 50% heterozygous dominants.
Phenotype will be 100% black rabbits and 0% grey rabbits.
The answer is; B
If we assume that the allele for black fur is B and that for white fur is b, crossing a homozygous black rabbit with a heterozygous black rabbit, will yield the following results (indicated in the punnet square below);
Genotypically, 50% of the population will be homozygous dominant, while 50% will be heterozygous. However, phenotypically, all offspring will bear black fur because the black fur allele is dominant over the grey allele.