What are the two strands of dna held together by?

5. Heterospory occasionally occurs in lycophytes and ferns, and in all seed plants. Botanists are convinced that heterospory must have originated more than once in the evolution of plants.

How would a disease that damages the mitochondria most directly affect the functioning of cells?

Why forest conservation in developed countries does not make a significant difference in worldwide conservation efforts?

Which contains dozens of carcinogen

Human body: what is the part of the brain that keeps muscles working, together?

How are daphina/cyclops similar to other crustaceans and arthropods in general?

Forest fire in Florida clears thousands of acres and trees

What is needed to fuel active transport? Where is this made in the cell?

Given an isolated desert city with little wind and long dry days throughout the year what would you consider before recommending an alternative energy source

What determinands the similarities in anatomical factors among organism? A. Location on Earth B. Environmental condition C. Predator-prey relationship D. chromosomes and genes