Answer:
Null hypothesis may be defined as the any type of assumption in which the observed difference between two sample in the statistical population is accidental. Null hypothesis is used in the field of genetics as well.
If one accepts the null hypothesis this means that there is no significant differences between the observed values and the expected values of the experiment. The rejection of null hypothesis explains that there may be significant difference between the expected value and observed value.
The correct option is (A) Endoskeleton.
Endoskeleton is common between Echinoderms and chordata class.
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What are the characterstics of Echinoderms?</h3>
- They resemble stars and can be elongated or spherical. They only have spiky skin since they are aquatic organisms.
- They exhibit organ system level organization and an open circulatory and digestive system. They have three lobes.
- Their gills or the cloacal respiratory tree are how they breathe.
- They have a simple radial nerve system and no excretory system. The body is unsegmented, with no discernible head.
- Both asexual and sexual gametic fusion and regeneration occur during their sexual reproduction.
- During indirect development, external fertilization takes place.
- They are capable of regeneration.
- Their sensory systems are not fully formed. Some of these include chemoreceptors, tactile organs, terminal tentacles, etc.
Learn more about the Echinoderms with the help of the given link:
brainly.com/question/6472932
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Answer:
A cell is the basic unit of life, essential to maintaining the physiology of the larger organism. In animals, certain organelles metabolize food into energy, and then uses the energy for repair, growth and reproduction.
Explanation:
The cell is the basic structural, functional, and biological unit of all known organisms. A cell is the smallest unit of life. Cells are often called the "building blocks of life". The study of cells is called cell biology, cellular biology, or cytology.
No, the correct answer is Ecosystem