Difference between first class and second class protein​

first- class proteins comes from eggs , meat  , fish and dairy products while non - animals related foods ,like vegetables and fruits, provide second - class proteins . first - class proteins contain a necessary amount of these important amino acids , but second - class proteins only contains some of them.

Explanation:

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.