Which chemical reaction shows photosynthesis?

A water + carbon dioxide + sunlight → oxygen + glucose

B carbon + oxygen → carbon dioxide

C hydrogen + oxygen → water

D nitrogen + hydrogen → ammonia

When the tympanic membrane vibrates with the same frequency as the incoming sound waves it is known as

The function of the respiratory system is to? A. rid the body of waste B. break down food C. transport materials in the body D. breathe

Orchid seeds are tiny, with virtually no endosperm and with miniscule cotyledons. If such seeds are deposited in a dark, moist environment, then which of the following represents the most likely means by which fungi might assist in seed germination,

How are the nervous systems of a flatworm and a fish different?

What did scientists hypothesize about heredity before Mendel's experiments

What do you notice about the width of an artery wall versus the width of a vein wall? Why does this make sense given the function of the vessels?

explain how the runoff waters from farm to land and golf courses might be dangerous to organisms living in ponds, rivers, or streams.

During which period of development is the unborn baby most at risk of developing a structural defect due to the effects of a teratogen

A green plant absorbs light. A frog eats flies. These are both examples of how organisms (1) obtain energy (2) escape predators (3) produce offspring (4) excrete waste

How do birth rates and death rates influence the population size