Cleavage as part of embryonic development is idiosyncratic since it involves the cell division which includes the process of mitosis with minimal or no growth in successive divisions. Hope this is right and the correct answer you are looking for.
I think its A
A dog will bark at animals and cars, but only if the environment permits.
-Seth
The number of producers is greater then the number of consumers , primary consumers is greater then the number of secondary consumers and the secondary consumers is greater then the number of tertiary consumer
<h2>540 million years ago
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Paleozoic.
Era immediately follows Precambrian It lasted about 4.5 billion years.
When did abundant fossil evidence first appear in the geologic record.
540 million years ago.
