Sponges have no nerve tissue or sense organs.explain why this means that sponges have no cephalisation.

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Answer 1

Answer: Cephalization is the differentiation of end part of the body into a head in which nerve tissue is concentrated. Sponges have a very loose nervous system and their cells work individually, not controlled by a nervous system. Since they have no defined head as a consequence of concentrated nervous system, the sponges could not have cephalization either.

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Which of the following is a true statement about niches

I need help with 1-12

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your doing biology ?

Which body system would be directely affected is T cells were destroyed by a virus like HIV?

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the body system that would be directly affedted is the immune system

Negative feedback is most like _____. A.an air conditioner that turns on if the temperature gets too hot B.adding wood to a burning fire to increase the heat. C.not eating anymore when you're full.

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First, we need to clarify what negative feedback means. Negative feedback is a response that is fed back to the input and that tends to reduce the fluctuation of the output. Negative tries to confer stability to the system. So, you can see that the option B. cannot be because if you add more wood to a fire the fire will increase instead of extinguish. The option A implies a signal (from the high temperature) that starts the air conditioner, so it brings the system out of the equilibrium. The option C. indeed signals that the "full" signal es fed back and the organism will stop eating and so it reaches equilibrium. The answer is the option C. not eating any more when you are full.

Answer:C.not eating anymore when you're full.

Which statement describes natural selection? It is the primary mechanism for evolution. It must act on structural traits. It acts to cause overpopulation. It causes learned skills to become heritable traits.

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The correct answer is this one: " It is the primary mechanism for evolution." Natural selection is described as the primary mechanism for evolution. It is a bit tricky though because the choice "it acts to cause overpopulation" might also be applicable.

it is the primary mechanism for evolution

Protists are a group of organisms that are characterized as eukaryotes (they have cells with nuclei) that are neither plants nor animals nor fungi. They are very diverse, and there are many hypotheses about their classification. The cladogram for protists is constantly changing and, sometimes, there are opposite hypotheses that both have data to support them. What is the implication of a changing hypothesis? It is acceptable because data are still being collected. It is acceptable because everything in science should always change. It is not acceptable because the correct answer needs to be found. It is not acceptable because science never changes.

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It is acceptable because data are still being collected.

Protists obtain food in 3 ways. They produce their own organic molecules, ingest, and absorb. Ingestive protists ingest food, or engulf bacteria. These protists extend their cell wall and cell membrane forming a food vacuole around the food item. Inside the food vacuole, enzymes digest the food. Absorptive protists on the other hand, absorb food molecules across their cell membrane which takes place through diffusion. Absorptive protists play a key role in decomposition. They are considered as important decomposers. Major producers like photosynthetic protists use light energy to manufacture their own food.

The hypothesis is constantly changed because data are still being collected, and due to this, hypotheses are accepted.

Further Explanation:

Protists are considered as first eukaryotes to be identified. They are different from prokaryotes because they have a well-defined cytoskeleton. They consist of different organelles and nuclear envelope. Protists have a varied range of cell surfaces. They can easily stand in an unfavorable environment due to the presence of outer covering. They have flagella for the locomotion. They can either be autotroph and heterotrophs. This is because they ingest food particles by pulling them in the intracellular vesicles referred to as phagosomes or vacuoles. They can produce by means of asexual and also by the sexual method. Protista that produces sexually undergoes meiosis, which is a reductional division resulting in the formation of haploid cells.The progeny that are produced by the union of two haploid cells allowed the formation of new allelic combinations by genetic recombination.

Cladistics is a process of classifying organisms depends upon their shared traits. The cladogram for Protista is continuously altered, and, at times, there are contradictory theories that together have data to support the hypothesis. It is suitable because facts are still being collected.

Learn more:

1. Learn more about the mitosis brainly.com/question/6462270

2. Learn more about the menstrual cycle brainly.com/question/723944

3. Learn more about the meiosis brainly.com/question/94813

Answer Details:

Grade: High School

Subject: Health

Chapter: Protists

Keywords:

Protists, phagosomes, vacuole, sexual method, asexual, collected, allelic combination, genetic recombination, progeny, hypothesis, cladogram.

Why are common names not a good reference to a species