Earthworm Data
Plot Number of Earthworms
A 1,145
B 978
C 125
D 1,008
E 959
Students in Mr. Smith's science class were taking random samples throughout the schoolyard for population analysis. One easy-to-locate organism that they counted was the earthworm, Lumbricus terrestris. Their data is displayed above. Several students were concerned about the count in plot C, as it was much lower than the other plots. Sandra suggested that they recount, but this time, count the earthworms over an extended period of time. Sam commented that it would skew the results in the other direction. He added that this was a random sample, and plot C was in sandy soil near the parking lot.
What comment would you make concerning the students experimental design?
A) They should omit plot C from the data and consider it as an error.
B) Sandra is correct. They should count the earthworms in plot C over an extended period of time.
C) Sam is correct. The plot selection was random and earthworms do not typically live in sandy, dry soil.
D) They should omit the idea of random selection of plots and purposely select plots I thought would be typical of earthworm habitats.
Earthworm have bones Some children confuse earthworms, which are invertebrates and have no bones, with snakes which are vertebrates and do have a bony skeleton and many ribs.
d) soil is the earthworm's niche.
Explanation:
An ecological niche can be define as the role which an organism plays in an ecosystem to survive and reproduce. The organism interacts with the surrounding environment and with the other living beings in order to survive.
Among the options given, d) soil is the earthworm's niche. is the correct option. This is because of the fact that an earthworm performs the function of decomposition and degradation of the dead plant materials in the soil. This way it helps in cleaning the soil ecosystem. The materials obtain after this process helps in enriching the soil. Thus the earthworm also performs the function of adding up minerals to the soil.
FELIPE (yo tengo)
Explanation:
Independent variable- effect of caffeine
Dependent variable- heart rate
Hypothesis- If a stimulant such as caffeine is administered to earthworm, then its heart rate increases.
Explanation:
The experiment is based on the research question; "Does caffeine increase the heart rate of an earthworm?" We can see from this research question that the independent variable is the effect of caffeine and the response it produces is a change in the heart rate (the dependent variable)
This now leads us to a hypothesis that states thus; 'If a stimulant such as caffeine is administered to earthworm, then its heart rate increases.'
ANSWER: D, earthworms that tolerate high pH become more common in the population.
REASONING: This is a result of natural selection. Natural selection is a process in which organisms that are better adapted to their environment will likely survive and reproduce more than those less adapted to their environment.
I'm pretty sure its D. soil is the earthworm's niche.
Explanation:
C)The earthworm length is longer than 6.0 cm because the worm needs to
be straightened.
Explanation:
The choice is true because the image clearly illustrates that the earthworm is screwed into a part of its body. To make a proper measurement the earthworm must be fully stretched and measured from the head to the extreme tip of the "tail"
D) the earthworm measurement is accurate because moore subtracted the beginning and ending points from the ruler
Hello
Because that creature had not bones in its structure.
Best regards
Option D
Explanation:
When the pH of the soil changed from the optimum level to the stress level then only the stress tolerant earthworm would be left in the soil.
The earthworm that can tolerate the low pH will be common in the coming generation of the earthworm because only fittest will survive and reproduce.
Due to this reason the low pH tolerant population of the earthworm will be common.
So, the correct answer is option D