<span>this is caused by a disease called basal cell carcinoma, because it causes ulcers and is slow to metastasize. Years of exposure to sunlight probably caused his cancer.</span>
The answer is A: Mass extinction.
"Abrupt disappearance of many land and marine species" = extinction of many species.
Translation proceeds in three phases: Initiation: The ribosome assembles around the target mRNA. The first tRNA is attached at the start codon. Elongation: The tRNA transfers an amino acid to the tRNA corresponding to the next codon.