How many alleles are there for the four main types of human blood

A microorganism has the following characteristics: eukaryotic, multicellular, has cell walls, and grows in long filaments. What is its general classification?

Which foods provide about a quarter of the trans fat consumed by american adults?

What is an exon? a part of DNA that codes for a functional protein a part of DNA that does not code for a functional protein the beginning part of the DNA molecule the end of part of the DNA molecule

Which of these energy resources might replace dwindling petroleum supplies one day? A) coal and natural gas, B) tar sands and uranium, C) oil shade and tar sands, D) wind and coal?

Which country has the most species of butterflies

Which structure of the trachea prevents it from collapsing inward and obstructing the air passageway?

What is a Divergent boundary and where is located?

A species displaying which of the survivorship curves is likely to produce the most offspring?

When comparing dogs to wolves, scientists found evidence that supports the idea they come from a common ancestor.

Riddle: I'm mostly made of water, but that's not all. I fill up the cell, from wall to wall.