Flatworm get most of their oxygen through diffusion.
Answer:
A
Explanation:
(March 16, 1774[1] – 1834) was the inventor of a cast-iron moldboard plow with replaceable parts, the first commercially successful iron moldboard plow
Introns because they are coding sequences.
Exons because they are non-coding sequences.
Please mark brainliest
Answer
The answer for first fill in the blank is “ positive”
The answer for second fill in the blank is negative
