Without external and internal stimuli, your body would not be able to maintain homeostasis. Homeostasisis a property of systems that regulates their internal environment (blood levels, temperature, nutrient levels, etc.) and tends to maintain a stable, constant condition despite changing external conditions.
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❖ This statement is False.
The order is actually:
cell → tissue → organ → organ system → organism
Organs are made of tissue and organs form the organ system.
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Answer:
The three-chambered hearts of amphibians and nonbird reptiles are facultative, allowing variation in blood flow through the heart.
Explanation:
In Anatomy, cardiac cycle can be defined as a complete heartbeat of the human heart which comprises of sequential alternating contraction and relaxation of the atria and ventricles, therefore causing blood to flow unidirectionally (one direction) throughout the human body.
Generally, the cardiac cycle occurs in two (2) stages;
I. Diastole : in this stage, the ventricles is relaxed and would be filled with blood.
II. Systole: at this stage, the muscles contracts and thus, allow blood to be pushed through the atria.
All amphibians and reptiles except for crocodiles (having four-chambered heart) have three-chambered hearts, which typically comprises of a partially divided ventricle and two atria.
Hence, the correct statement about the three-chambered hearts of amphibians and nonbird reptiles is that, the three-chambered hearts of amphibians and nonbird reptiles are facultative, allowing variation in blood flow through the heart due to the partially divided ventricle.
In A and B we see the number of phenotypes that can be found, in a case of polygenic inheritance, depends on the number of allele pairs involved
<h3>Genetic distance</h3>
The knowledge of the genetic distance between genotypes of a population of interest is important for a breeding program, as it allows the organization of germplasm and a more efficient sampling of genotypes.
<h3>Gaussian</h3>
The normal distribution is a very useful model in statistics, and it would not come as a surprise as the sum of independent effects (or not very correlated effects) should, if there were many of them, normally distribute (always subject to certain assumptions).
With this information we can conclude that in graph <u>A</u> we see a higher frequency of medium-sized individuals, showing zygosity, and in <u>B</u>, <u>heterozygosity</u>.
Learn more Phenotypes about in brainly.com/question/20730322
