Identify the best description of a heme group.
a. single metal atom bound to each of the four oxygen
b. binding parts of hemoglobin family of hormones that stimulate hemoglobin production under hypoxic conditions
c. one of four iron‑containing parts of hemoglobin that bind to oxygen molecules
d. multi-part protein that reversibly binds to oxygen molecules for transport in blood

All vaccination should(n’t) be mandatory! 1.at least 5 sentences explaining 2.why? 3.in the end summarize the sentence

Tropical rain forests support more species per unit area than any other terrestrial ecosystem. what is one way rain forests are important to the health of the biosphere?

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population. b) the separated population is small, and genetic drift occurs. c) the isolated population is exposed to different selection pressures than the ancestral population. d) different mutations begin to distinguish the gene pools of the separated populations. e) gene flow between the two populations is extensive.