Question

plants that yaks eat grow under stressful conditions. decreased atmospheric pressure results in changes in the concentrations of gases, as represented below. change in gas molecule density at different altitudes. 2. which statement best explains why the carrying capacity for producers in extreme - altitude ecosystems is less than in sea - level ecosystems? (1) there is more oxygen available to use for cellular respiration at high altitudes. (2) there is less carbon dioxide available to use for photosynthesis at extreme altitudes. (3) there is increased water vapor available at extreme altitudes which limits the process of photosynthesis. (4) there is decreased pressure at high altitudes, resulting in faster cellular respiration. the pika is another herbivorous mammal species that inhabits the tibetan plateau. pika move quickly and spend much of their time foraging for food and keeping a lookout for predators. they are small (5 - 9 inches long), live in systems of underground tunnels that they dig and maintain, and lack a large heart and large lungs. the photograph and graph below show some information about the tibetan plateau. relationship between altitude and temperature. 3. construct an explanation based on evidence that natural selection leads to a behavioral adaptation that pika possess that would help them to survive in the tibetan ecosystem.

Explanation:

For question 2, photosynthesis in producers requires carbon - dioxide. At extreme altitudes, lower atmospheric pressure means less carbon - dioxide available for photosynthesis, reducing the carrying capacity for producers. For question 3, pikas' behavior of moving quickly, foraging, and keeping lookout for predators is a behavioral adaptation. Natural selection favors pikas with these behaviors as they are more likely to survive predation and find food in the Tibetan ecosystem. Living in underground tunnels also provides protection from predators and harsh environmental conditions.

Answer:

1. (2) There is less carbon dioxide available to use for photosynthesis at extreme altitudes.
2. Pikas move quickly and forage for food, which helps them find necessary resources for survival. They keep a lookout for predators, increasing their chances of avoiding predation. Living in underground tunnels provides shelter from predators and harsh weather, a behavior favored by natural selection for their survival in the Tibetan ecosystem.