On average, the moon's umbral shadow is
1. too short to produce a total solar eclipse.
2. too bright to produce a total solar
eclipse.
3. too wide to produce a total solar eclipse.
4. too faint to produce a total solar eclipse.
5. too long to produce a total solar eclipse.

Average annual precipitation and are the two major features that define the biomes on earth.

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.

Explain why scientists use the word dominant for certain traits.