As a control for the sasquatch experiment, a fake deer is placed in the forest. The role of this control in experiment is to provide a basis of comparison to the experimental group.
Scientists often analyze hypotheses developed by them by means of controlled experiments. A controlled experiment is a scientific test performed under controlled conditions, denoting that only one or a few variables are altered at a time whereas, all the remaining variables are kept constant.
Controls are utilized in an experiment to reduce the effects of variables besides the one being tested. An experimental group is also sometimes referred to as a treatment group, which receives a treatment in an experiment.
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The answer is D.) respitory tract
Answer:
B) Ice & Glaciers
Explanation:
is where most of Earth's fresh water located
Question 9: The right answer is B (the second one)
The two major types of cellular, prokaryotic and eukaryotic organisms.
* Prokaryotes are identified with bacteria: most live as single-cell organisms but some bacteria associate in a chain. Prokaryotes have their DNA in the cytoplasm of the cell.
* Eukaryotes have a nucleus, a compartment separated from the rest of the cellular contents, which contains the DNA.
Question 17: The right answer is incomplete dominance.
Incomplete-dominated genetic action is a type of genetic action where one of the alleles outweighs the other in the production of qualitative phenotypes, without the dominant allele completely overshadowing the heterozygous recessive allele. Two copies of the dominant allele are required to produce the dominant phenotype. Since the recessive allele can perform its function at the heterozygous stage, this genotype produces a phenotype (the heterozygous phenotype) which differs little from the dominant phenotype.
In our case the phenomenon of incomplete dominance gave a pink color (between white and crimson) instead of crimson color when the white flowering plant was mixed with the crimson flower plant.
Question 19: The right answer is Speciation occurs gradually.
Speciation is a term that means the formation of new species.
Gradualism is an evolutionary theory according to which new species occur by gradual transformation of ancestral species, by evolution.
These transformations are slow and regular. Otherwise expressed: evolutionary theory according to which speciation is gradually effected by small successive changes over long periods.
Genetic variation in a population allows for phenotypic variation, meaning that different traits exist in the same population. When the environment changes, the members of the population are tested by natural selection with regards to how well adapted their specific traits are to the new environment. If the traits they have do not suit their environment, this results in reduced survival and fitness, leading to less of that trait in the population. However, if the traits they have are adapted to the environment, they become naturally selected for with better survivability and fitness (leading to a higher frequency of that trait in the population). Thus, evolution has occurred.
