Feedback always occurs when

A.
the input of a system comes back to influence the output of and processes involved in that system.
B.
the output of a system comes back to influence the subsequent functioning of that system.
C.
no new raw materials are added to the system.
D.
no products or wastes are formed by the system.

Describe pasteur’s results and how they disprove spontaneous generation.

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 is a kingdom? protistachordataprokarya mammalia