UN ANIMAL TIENE CIRCULACIÓN CERRADA SIMPLE CUANDO:

a) no tiene hemoglobina b) no tiene sangre

c) la sangre pasa una sola vez por el corazón en un recorrido.

d) la sangre pasa 2 dos veces por el corazón en un recorrido.​

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

Drag each description to the correct location on the image. not all descriptions will be used. describe the parts of a comet. the frozen part of the comet the atmosphere of gases and dust formed when the nucleus vaporizes tail made of small, solid dust particles tail made of ions that appears to point away from the comet's orbit

Across of blue x blue (both heterozygous) would result in