Select the correct statement about photosynthesis by primary producers.

cyanobacteria carry out more of the world's photosynthesis than protists do.
photosynthetic protists and prokaryotes carry out the majority of the photosynthesis in aquatic communities.
land plants carry out over 80% of the world's photosynthesis.

What would happen if the krill were removed from the food web

The negative change found inside the plasma membrane is created by potassium ions sodium ions hydrogen ions chlorine ions

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.