Which of the following is not a type of channel used in production of electrical signals in neurons? a. leakage channel b. voltage-gated channel c. ligand-gated channel d. mechanically gated channel e. ion-gated channel

List five ways we are indebted to phytoplankton

Which of the following best describes the expensive tissue hypothesis? brains require more energy, so the gut had to be reduced, and larger brains and tool use led to higher quality diets. increasing body size means that homo neanderthalensis had to include more fat in its diet. brains require more energy, so the gut had to be reduced as brains got bigger. brains require more fat, so the gastrointestinal viscera (gut) had to expand, and hands were needed to acquire more food.

Which description shows competition in an environment? an organism that feeds on some food an organism that finds a place to sleep three organisms of the same species living in an area three organisms battling over limited resources