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natita [175]
4 years ago
6

Type of symmetry in which body parts are arranged in a circle around a central point

Biology
1 answer:
lukranit [14]4 years ago
8 0
Type of symmetry in which body parts are arranged in a circle around a central point is called radial symmetry.  
<span>
This type of symmetry is characteristic for the sessile animals like Cnidaria and Echinodermata. Organisms with radial symmetry have no left or right sides, they have a top and a bottom surface, or a front and a back.</span>
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Which molecules of the adaptive defense system provide humoral immunity by circulating freely in the blood and lymph, where they
alisha [4.7K]

Answer:

Adaptive immune defense system consists of lymphocytes like B-lymphocytes and T- lymphocytes. B-lymphocytes provides humoral immunity while T- lymphocytes provide cell-mediated immunity to the body.

99% of lymphocytes circulate freely in the blood and lymph. B lymphocytes differentiate into plasma B cells and B memory cells when interact with antigen presented by T helper cells.  

Then plasma cells secrete antibodies in the circulation which binds to extracellular antigens through antigen-binding site. Then the bounded antigen is recognized by receptors present on phagocytic cells. This receptor binds the Fc region of antigen bounded antibody and destroy the antigen by phagocytosis.

5 0
3 years ago
Protists can be harmful for which of the following reasons?
sergejj [24]

Answer:

The answer is both  the first (Cause disease) and second (Cause algal blooms)

Explanation:

Protists may cause disease and even kill living things. Also, algal blooms are essentially protists but have chloroplasts- which plays a part in them being harmful.

6 0
3 years ago
Read 2 more answers
How would the cycle be different if there were no water on earth?
Luda [366]

Answer:

What I expect would happen: First, there would be no clouds. Lack of clouds would mean there would be no rain and the average temperature of the Earth would increase, resulting in large areas of land becoming desert.

Explanation:

The water cycle is the process where water falls as rain, is transported via rivers and streams to lakes and oceans, evaporates into the sky, condenses into clouds, and falls as rain again. Here's a diagram:

water.usgs.gov

water.usgs.gov

So what would happen if there were no condensation stage?

The condensation stage is the one where water vapour gathers together into clouds (and when the clouds become heavy enough with vapour, release water as rain). So the first answer is that there would be no clouds.

Without clouds, I foresee a few things happening:

From clouds come rain. With no clouds, there would be no rain.

Clouds move moisture from lakes and oceans (where it evaporates up) to mountains and other places inland that spark rainfall. And so vast stretches of land would become desert.

Clouds reflect sunlight and help cool the Earth. With no clouds, the average temperature of the Earth would increase significantly.

And so to summarize what I expect would happen. First, there would be no clouds. Lack of clouds would mean there would be no rain and the average temperature of the Earth would increase, resulting in large areas of land becoming desert.

Explanation:

4 0
3 years ago
Which sequence lists the correct order of events in the area represented in the diagram?
maria [59]

You didn’t add the diagram

8 0
3 years ago
b) Identify a dependent variable in the experiments. Identify the reasoning of the scientists when they tested the number of col
Fed [463]

Answer:

Explanation:

Dependent variable is the outcome that is measured. This is the number of colonies produces by the clinical Isolate strain. Without the growth media the strain cannot thrive or reproduce hence their dependent on the media for survival.

While independent variable is the treatment that is varied in an experiment. It usually not dependent on any variable and can stand on it own.

The growth media that is lacking in chemical is the independent variable because it stands on it own and it can be carried depending on the experimental design it could be a chemical based growth media or no chemical like the one used in this experiment.

4 0
3 years ago
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