What is a blowout? a shallow depression caused by deflation a stony surface layer caused by deflation a shallow depression caused by abrasion a stony surface layer caused by abrasion?

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere,b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify,d)anaerobic bacteria kept thriving with more oxygen