What are the main producers in equatic enviornments?

Christie's doctor recommends that she eat 40 grams of protein a day. she's already consumed 50% of her protein recommendation for the day. how many servings of the given snack should christie have to meet her daily protein recommendation?

How does natural selection change thephenotypes within a population over time?

What will happen if two of the base pairs of the stand of the dna are switched