The thoracic cage is formed by the 12 pairs of ribs with their costal cartilages and the sternum.
True
All somatic cells have same genes but the genes whose product is not needed are turned off. Some genes are expressed constitutively and some genes are turned off and on depending upon the requirement of proteins.
GRIMNERGrowReproduceIrritability (ie, being able to sense changes in the environment, detect danger, etc.)MovementNutrition (eating and drinking)Excretion (get rid of waste materials)Respire (breathe)
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Answer:
A. These homologous structures indicate that these four organisms all share a common ancestor.
Explanation:
Homologous structures mean the organs will have similar structure, but not necessarily function (human arm vs whale's flipper). While analogous structures are similar in function but not structure (wings of an airplane vs wings of a bird). Since the question states that they are similar in skeletal structure, we know they must be homologous structures, thereby eliminating B and C. D is not a choice because the question does not provide anything about the order of evolution. Therefore the answer is A. These homologous structures indicate that these four organisms all share a common ancestor.
Answer:
As somatic cells are diploid (2n) 2n=56
gametes receive only haploid set so, n=28
