Answer:
Structures that have no apparent function and appear to be residual parts from a past ancestor are called vestigial structures. Examples of vestigial structures include the human appendix, the pelvic bone of a snake, and the wings of flightless birds.
Explanation:
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The light red layer between the white lumen and blue lamina propria consist of epithelium cells.
<h3>What is a lamina propria?</h3>
A lamina propria is a type of connective tissue that is present and found under the thin layer of tissues covering a mucous membrane.
<h3 /><h3>Characteristics of the lamina propria</h3>
- It is a very large layer of connective tissue
- It divides the innermost layer from a layer of smooth muscle tissue.
- it is a light red layer barrier located between the white lumen and blue lamina.
- It is made up of epithelium cells.
- It is also found in the respiratory tract, the Gastrointestinal tract, and the urogenital tract.
Thus, the light red layer between the white lumen and blue lamina propria consist of epithelium cells.
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Answer:
D. Sterility Locus
Explanation:
Angiosperms have several mechanisms to prevent self-pollination due to the advantage of cross-pollination. One of such mechanisms is self-incompatibility genes present on the sterility locus.
These genes determine the germination of the pollen on the stigma. If both the pollen and stigma carry the same allele of the gene present at the sterility locus, the germination of pollen is prevented.
The sterility locus has multiple alleles and the presence of the same alleles at the same locus in both pollen and stigma prevents the pollen germination.
For example, pollen from S1S2 individuals can not germinate on the stigma with the S1S3 genotype. Here, the pollen does not obtain water as required for germination from the stigma and are unable to germinate.
Answer:Mutualism
Explanation:a relationship in which both species benefit, is common in nature. In microbiology, there are many examples of mutualistic bacteria in the gut that aid digestion in both humans and animals. Commensalism is a relationship between species in which one benefits and the other is unaffected.
