Answer:
A. cnidarians
Explanation:
Comb jellies are most closely related to Cnidarians. Cnidarians are marine invertebrate organisms which make use of their cnidocytes filled with tentacles in catching preys.
They also have body parts such as the ectoderm and endoderm and a characteristic middle jelly layer called the mesoglea which is similar in a comb jelly.
Examples of Cnidarians include sea anemones and corals.
Immunological memory accounts for <span>the ancient observation that someone who had recovered from the plague could safely care for those newly diseased. </span> <span>Immunological memory is a property of the immune system to recognize the pathogen (antigen) that the body has previously encountered. As a result, immune system corresponds by inducing immune response via memory T and B cells.</span>
Individual, population, community, ecosystem
Answers:
Zooplankton help other populations survive by keeping out other herbivores
Explanation:
This is because a keystone species are species that have large effect on the the habitat and through its effect they help to keep the ecosystem in existence. They make sure that the ecosystem exist. They help populations survive by keeping out herbivores and feeding on the algae. They help drive nutrients cycle and transfer energy from algae to invasive fish.
