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inessss [21]
3 years ago
14

Flatworms are the first organisms we have discussed with an anterior-posterior orientation. How does this affect their movement

compared to the movement of more primitive organisms
Biology
1 answer:
Talja [164]3 years ago
6 0
<h2>Anterior-posterior orientation</h2>

Explanation:

Flatworms have an anterior-posterior orientation and as a result more coordinated and deliberate movement is established  

  • Flatworms also called Platyhelminthes are a phylum of relatively simple soft-bodied invertebrate animals
  • They are the largest phylum of acoelomates and are found in marine,freshwater and even in some damp terrestrial environments
  • Movement in some flatworms is controlled by longitudinal,circular and oblique layers of muscle
  • Flatworms anterior end helps in moving towards their food while the posterior end ensures that these organisms walk away from irritants

                                   

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Answer: The observation "A" leads us to conclude that the finches populations are from two different species

Explanation:

According to the biological concept of species, <em>a set of individuals are from the same species if they are able to reproduce and leave fertile offspring</em>. This is key so one species can be successful and perpetuate through time. If they cannot leave descendants, then the species will be extinct. However, it’s possible that two individuals from different species mate and have descendants, but they cannot leave fertile offspring. When they are from different species, the offspring will be sterile and it is called a hybrid.  

In the case of the South American finch, the island's finch population and mainland's finch population belong to different species because their offspring is sterile. To have different features, as different feather's color, or to have other dietary preference is not enough to say that they are different species. This is because within the same species, individuals can have variations. For example, we can different eye color and belong to the same species.

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Drag the tiles to the correct boxes to complete the pairs. Match the disadvantages to the correct conservation methods.
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Answer:

Next to threat to birds put building national parks it'll give the a place to mate and lay eggs.Next to lack of protection against external threats put using wind energy. Next to fewer collection centers put recycling resources.

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The students concluded that pea plants grew better in compost than did melon plants. Which of the following best addresses the v
musickatia [10]

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c. The conclusion is invalid because other variables in the experiment affected the results.

Explanation:

Consider the complete problem:

A group of students designed an experiment to determine the effect of compost on the germination and growth of plants.

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plants grew they recorded the plant length, number and size of leaves, and general health observations.

The following observations were recorded.

 In all treatments, more pea seeds germinated than melon seeds

 There was a week of rainy weather at 3 weeks

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 Melon plants grew longer than pea plants, but many melon leaves showed signs of yellowing as the weeks passed

The students concluded that pea plants grew better in compost than did melon plants. Which of the following best

addresses the validity of the conclusion made by the students?

a. The conclusion is valid because the independent and dependent variables in the experiment were controlled.

b. The conclusion is valid because the experimental design included a large sample size.

c. The conclusion is invalid because other variables in the experiment affected the results.

d. The conclusion is invalid because the units of measurement were not given in the experimental design.

<em>In order for the conclusion to be valid, all the independent variables should have been controlled. In this case, the independent variables such as the amount of water received by the plants, nutrient requirement of the plants, etc. were not controlled leading to fungal attack on the melon plant.</em>

<em>Hence, the conclusion is invalid because other variables that ought to have been controlled affected the experimental outcome.</em>

<em>The correct option is c.</em>

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