What chemicals are the sides of the DNA ladder made of?

The influenza virus cause the flu, but not other diseases. why?

1. watermelon, papaya, oranges, bananas, and lemons are included in this food group. vitamin c 2. you need 6 or more servings of this food group each day vitamins d and a 3. found in fruit and keeps blood vessels healthy calcium 4. vitamins found in milk bread and grain 5. a mineral that strengthens bones fruit

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?