Why, given two bodies of water, one with a lower temperature may have more heat?

An enzyme lowers the energy of activation. what does that mean?

Consider the classification levels of a human. eukarya ,animalia ,chordata ,mammalia ,primates, hominidae ,homo ,sapiens .which is the most specific taxonomic level in the classification system above? a sapiens b homo c hominidae d primates

Why are current extinctions of concern to enviromentalists?