<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.
yeast uses glycolysis and alcohol fermentation to break down sugars in dough then it releases alcohol and carbon dioxide as waste and the carbon dioxide gas causes the bread to rise
For number 8:
all radio waves,
infrared radiation,
visible light,
ultraviolet radiation,
X-rays,
gamma rays.
Answer:
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