What are phytoplankton and zooplankton? microscopic plants and animals
fossils of plants and animals
types of fossils fuels
stored solar energy

Hemoglobin is the compound in red blood cells that carries oxygen to the body. the distribution of hemoglobin in women in g/dl of blood is approximately normally distributed with mean 14 and standard deviation 1. too little hemoglobin, and you're anemic. 2. too much, and (unless you live at high altitudes), you can have other problems.

Based on anatomical similarities, to which modern animal is dr. digger’s creature most closely related?

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi