Practice 1. A 6.0 m2 area of land contains 32 small
poplar trees. What is the population
density of poplar trees?

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.

well the answer is 2!