Answer:
What is the question? What do you need help with?
Explanation:
Answer: A mutagen is a chemical compound or form of radiation that causes mutations, which of course means a change in the dna of a cell. So, your answer would be C) an environmental agent that changes DNA.
Arachnids live anywhere they can find food. They live in grass fields and wet swamps. They live in hot, sandy deserts and cool, dark caves. They live in tropical rainforests and on rocky mountaintops. Arachnids like mites and ticks live in the fur of animals.
Arachnids often eat other invertebrates. Arachnids eat other arachnids, insects, small rodents, and even some small birds. Mites and ticks however feed off the blood and tissue of living animals, even humans. Other mites eat from liquified plants, fungus, and other organic materials.
There are two known gene products, RNA and protein.
The regulation of gene expression is important because in different moments of human deveopment different substances are needed and also during the stable fase of human development (adulthood) necessities are dieverse.
The regulation of gene expression is what makes cells and an tissues different and that is why it's also so important.
This question is indeed not east. Hope I suplied enough information according to your needs (there is still way more info on the subject).
Hope it helped,
Happy homework/ study/ exam!
A. Protects the seed from damage as it travels
protects the seed not only from mechanical stress but also from microorganism invasion