<u>Answer:</u>
Recent evidence suggest that feathers evolved from scales and suggest that 'feathers and pycnofibers' could be homologous.
<u>Explanation:</u>
- One of the major difficult issue related to bird evolution is the evolution of feathers.
- Feathers are considered as the most 'complex integumentary structures' which are found in vertebrates.
- Evolutionary developmental biology suggests that the 'planar scale structure' is been modified for developing into feathers by 'splitting' to form web like structures.
- Scales and Feathers consist of 'two distinct form of keratin' so it was thought that 'each type was exclusive skin structure' but recent study suggests that they are developmental expressions of same skin structures.
Answer:
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Explanation:
The anther and filament, the anther produces pollen. They are the parts of the male reproductive organ in a flower.
<h3>What are the male parts of the flowers?</h3>
The flower can be considered as the reproductive structure of flowering plants.
The anther and filaments represent the male structures of a flower, which may also contain female structures.
The stamen can be considered as the male reproductive organ because this structure is responsible for producing pollen which contains germinal cells in a flower.
Learn more about flower parts here:
brainly.com/question/3197281
