The process in late pregnancy when the fetal head begins to decend into pelvis.

How does photosynthesis and cellular respiration affect the balance of oxygen and carbon dioxide in the atmosphere?

Chromosomes are best know as units of an organism's- 1. dietary intake 2. genetic make - up 3. local habitat 4. survival instincts

Which usage of water uses the least amount of water in a year in the United States? A. public water supply B. livestock C. irrigation D. industry

Chromosome is to cactus as gene is to O needle weeds desert

Caves are formed by the actions of acid rain plant roots river water groundwater

Why does the United States experience winter during the months of November through early March

Simulations are useful for understanding how natural processes work but are not always representative of the real world. How does this simulation differ from what might happen in a true ecosystem?

Metamorphic rock with A handed appearance due to the alignment of minerals are

What results when the combined effect of two different drugs taken together exceeds the sum of the individual drugs administered alone?

Animal lays eggs with a tough leathery watertight shell