What structures make the heart an efficient pump?

In one butterfly species, the colors of individuals range from white to black, with many shades of gray in between. If the butterflies in a mountain population become more and more similar in color over several generations (e. g.

What would happen if the lateral lines on a fish did not function properly?

If water were a nonpolar molecule, how would the properties of water be different? A. Water would not be as heavy a molecule. B. Water would not rise inside plants. C. Water would stick together more strongly. D.

If the concentration of DDT in zooplankton measures 0.04 parts per million, what is the approximate concentration of DDT at each other trophic level shown?

Why do organisms that reproduce asexually reproduce in less time than those that reproduce sexually? A. Asexual reproducers have less competition for finding mates because there are many more of them then there are sexual reproducers. B.

Which domain (s) include species whose cells have cell walls? A. Archaea B. Bacteria C. Archaea and Bacteria D. Archaea, Bacteria, and Eukarya

In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons.

Oxidative phosphorylation is the third step in cellular respiration. It is composed of two smaller steps (electron transport chain and chemiosmosis). What molecules are donating their energy to power the proteins in the ETC?

Wow was important for Mandel to study a large sample of pea plants

What are the similarities between photosynthesis and aerobic and anaerobic respiration?