Х Parte A: Los
embriones de pollo,
ratón y humanos
pasan por una etapa
durante la cual tienen
hendiduras y arcos
en el cuello similares
a las hendiduras
branquiales y los
arcos branquiales de
los peces. Explique lo
que sugiere esta
evidencia sobre las
relaciones evolutivas.

Which element provides strength to the exoskeleton of clams and oysters

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them

9. the history of life on earth is recorded in