Why do exons have to be
spliced together?

In genetic engineering, scientists splice together genetic material to produce new genes or to alter a genetic structure. In messenger RNA , the introns are removed, and exons are spliced together to yield the final messenger RNA that is translated. See also exon intron. The American Heritage® Science Dictionary Copyright © 2011.

Explanation:

The exons are pasted together by the spliceosome to make the final, mature mRNA that is shipped out of the nucleus. ... During splicing, the introns are revmoved from the pre-mRNA, and the exons are stuck together to form a mature mRNA that does not contain the intron sequences.

they each offer a fresh glut of resources to the organisms that can arrive and exploit them. as individuals and new species continue to appear, they actively and passively alter the environment. competition for shared resources increases, local abiotic and biotic conditions shift, and the relative abundances of species change accordingly. the process is called ecological succession, and it is one of the earliest and most well-known concepts in ecology.

the right answer is a. skin cells forming from sunlight.

the liver is an organ endowed with a fantastic ability to regenerate

. thus, if a hepatectomy (ablation) of 70% of the hepatic mass is performed in the rat, there is complete recovery in 7 to 10 days.

prokaryotes are beings that have existed since the existence of life on earth, and do not come from another realm.

ribosomes are organelles that exist naturally in eukaryotes, either in free form or attached to the endoplasmic reticulum.

click to let others know, how is it

mark brainliest and have a great day!