Hydra and Obelia are cnidarians (species of aquatic organisms) that belongs to the Class Hydrozoa.
Several ways in which Obelia differs from Hydra are;
- Hydra is a predative species that lives on substrates such as wood, while Obelia is a colonial species that lives as polyps on branched frameworks.
- Hydra is found in freshwater habitats, while Obelia is found in marine habitats.
- Hydra undergoes the medusa form in its life cycle, while Obelia undergoes the two forms (polyp and medusa) in its life cycle.
- Hydra has great regenerative powers while Obelia does not have great regenerative powers.
Answer:
<u><em>The correct option is C) Like other populations, the human population is affected by a variety of factors in the environment.</em></u>
Explanation:
<em>According to the theory of natural selection, those organisms which are better able to live and survive in an environment are able to live and reproduce. </em>The same case goes in the scenario of humans.
Certain environmental factors make the Earth favorable enough for humans to multiply rapidly. Other factors such as a disease or infection outbreak may result in unfavorable conditions for the humans. As a result, the population of humans will decline.
A. T-A-C-G-A-T
A and T pair together, and G and C pair together. There are no U’s because U’s are in RNA, not DNA.
Answer:
Letter B.
Explanation:
Aquaporins, also known as "water channels," are the main transport of water through the membranes of plant, animal, and bacterial cells. These channels allow the water to travel into and within cells and, at the same time, exclude the passage of ions and solutes.
What makes letter B the correct answer, is the form of transport and shape of the channel that allow water according to the osmotic gradient. In this model, letter A shows simple diffusion, while C and D seem to illustrate gated channels.
Conjugation is the process that results in genetically different bacteria
