If it has valves then it is a vein.
Answer:
Protists help break down dead material and help produce oxygen
Explanation:
I just took the quiz on k12
RNA has Uracil instead of Thymine. All the other three bases also occurs in RNA, adenine, guanine and cytosine. Therefore a ATA DNA codon will be transcript to UAU by RNA. Both Thymine and Uracil have the same role in however have minor chemical differences.
nebular hypothesis
The most widely accepted theory of planetary formation, known as the nebular hypothesis, maintains that 4.6 billion years ago, the Solar System formed from the gravitational collapse of a giant molecular cloud which was light years across. Several stars, including the Sun, formed within the collapsing cloud.
I would say b! The sunlight is absorbed by the thylakoids (inside the chloroplast) which is part of the process of photosynthesis
