Answer: cell wall, chloroplasts, plastids, and a central vacuole
Explanation:
Tiktaalik is a transitional fossil which shows how fish evolved into amphibians and reptiles. So the correct option is B.
What is Tiktaalik?
Tiktaalik is a direct ancestor of tetrapods or four-legged animals. It is an extinct fish-like animal and it lived on earth 380-385 million years ago (Devonian period).
The word Tiktaalik is derived from the <em>Inuktitut</em> language which loosely translates to large freshwater fish. This animal had characteristics of both fish and tetrapod and is therefore called the link between these two kinds of animals.
The characters resembling fish are gills and scales and the characters resembling tetrapods are rib bones, movable neck and lungs. There are characters that are a mix of both tetrapods and fish. These are bones and joints in limbs but fish-like fins instead of feet or hands.
Read more about Tiktaalik, here
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Answer:
RNA splicing
Explanation:
RNA splicing is the mechanism by which messenger RNA precursors (pre-mRNAs) are processed to generate mature mRNA transcripts in eukaryotic genomes. During RNA splicing, the non-coding regions of the pre-mRNA sequence (i.e., introns) are removed, while coding regions (i.e., exons) are joined together. In consequence, the resulting mature mRNA is shorter than the pre-mRNA. RNA splicing reactions are catalyzed by the spliceosome, an RNA-protein complex that removes introns from the pre-mRNA. After RNA splicing, the mature mRNA is used as template to produce a specific amino acid sequence, where triplets of RNA nucleotides (codons) in the mRNA are used to assemble specific amino acids in order to form a protein.
