Answer:
the first trophic level shows a primary producer
Complete question:
Categorize the following situation as either a pre- or postzygotic isolating mechanism and then specify which type of pre- or postzygotic isolating mechanism it is.
A short hike through the Sandia Mountains from early spring to late summer will often reveal several different species of penstemon. The Rocky Mountain Penstemon blooms in the spring while the very similar inflated penstemon blooms in late summer. As a result, hybrids are rarely encountered.
Answer:
- pre-zygotic isolating mechanism
- Type: seasonal or temporal
Explanation:
There are different mechanisms of reproductive isolation. These are barriers that inhibit or interrupt the genetic flux between different species. These mechanisms are about the biological characters of each species that prevent the reproduction with other species.
The reproductive isolation mechanisms might be either prezygotic or postzygotic.
-
Pre-copulatory or pre-zygotic:
- Ecological or due to habitat isolation;
- seasonal or temporal;
- Sexual or ethologic;
- Mechanical;
- Gamete incompatibility.
2. Post-copulatory o post-zygotic:
- Hybrid inviability
- Hybrid sterility
- Hybrid with diminished viability and or fertility
- Cytoplasmatic interactions.
The exposed situation is an example of prezygotic isolation due to seasonal or temporal barriers. Penstemon blooms in the spring, while the very similar inflated penstemon blooms in late summer. <em>Probably, if they had the same reproductive season, they would produce hybrids</em>. But as they are isolated by different reproductive seasons, they do not. <em>As they can not even fertilize, they are considered to be prezygotic isolated species. </em>
Answer:
A
Explanation:
A moon is more likely to orbit because galaxies are way to big and suns would burn the planet A asteroid is very unlikely to orbit
Carbon dioxide is returned to the atmosphere primarily by the Respiration of animals and plants (the consumers).
Explanation;
Respiration by both plants and animals is an important natural source of carbon dioxide. Carbon dioxide is a by product of the process of respiration, a chemical reaction that plants and animals use to produce energy they need to carry out day to day activities.
Plants and animals use this process to produce energy which is used to fuel normal activities such as growth and movement. The process uses oxygen to break down nutrients and release energy, but also creates water and carbon dioxide as byproducts.
