The fossil evidence found in these sedimentary layers best implies that a) invertebrates evolved into vertebrates. b) animals evolved bony skeletons after shells. c) plants and animals with bones evolved together. d) land animals and marine animals evolved together.

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The fossil evidence found in these sedimentary layers best implies that animals evolved bony skeletons after shells

Explanation:

Fossil is not only describing when organism lived, but it also gives information about the “progression and evolution of life” on this earth over millions of years. Fossils also give information that previous life in earth is different from present life.

According to evolutionist around 500 million years ago complex internal skeleton organism came into existence. They told fish had firstly evolved and they dominated the sea. Fossilization is very rare process.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.