2. Which of the following is a commensalistic relationship? A) Honeybees get food from flowers and carry their pollen.
B) Egret birds get food from buffaloes, who are unaffected.
C) Ants get food from aphids and protect them from predators.
D) Tapeworms use humans for food and make them sick.

There are only about 250,000 known fossil species. true or false

How many chromosomes are in a human gamete?

American scientist, linus pauling, was one of many scientists racing to discover the molecular structure of dna. pauling initially thought that the molecule was a triple helix. later, james watson and francis crick unveiled their double helix model, which turned out to be an accurate description of the molecule's shape. why did watson and crick succeed when pauling failed?