Birds that can fly usually have hollow, lightweight bones. penguins, a species of flightless bird, have heavy and dense bones. why is this an advantage?
they are less likely to be injured on the ice
their bones them retain body heat in the cold temperatures
they are more efficient hunters in the water due to heavier bones
they are more efficient hunters on land due to heavier bones

Which of the following statements about c4 carbon fixation is not true? a c4 carbon fixation is an adaptation for plants exposed to high light intensityb. c4 carbon fixation occurs in more plants than c3 carbon fixation.c c4 carbon fixation is more common in areas of high temperatures than c3 carbon fixation.d. c4 carbon fixation occurs in the inner cells of a leaf rather than the entire leaf.

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes