Answer:
Whales = lungs
Clams = gills
Spiders = tracheal system
During the embryonic period, the embryo develops according to the proximodistal principle, which means that the embryo develops the center of the body before other parts are developed.
The embryo which undergo various degree of development in the womb. The embryo begins in the center of the body which houses a lot of important organs such as the heart , liver, kidney etc.
These organs require a very well defined and special development which is why development starts from this part.
The trunk of the body such as the hand and legs are developed after the center parts of the embryo is developed.
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Answer:
There are many animals that may survive a flood like a goose, swan. But the main animal would be a duck which have webbed feet to help them get swim through the water to finally fly up into the air and find a nice place to rest and make a new nest. also having the feathers to have the water roll right off them making it so the water does not weigh them down when flying. also ducks can dive under the water about 5 feet to retrieve food.
Explanation:
I hope this helped!!
Answer:
Breast, Colorectal and Lung cancers are the most common. Smoking and Tobacco. Diet and Physical Activity. Sun and Other Types of Radiation are the most common causes of cancer.
Explanation:
I think this is what you need, if not could clarify a bit more in the question.
Answer:
Four
Explanation:
During spermatogenesis, some diploid spermatogonia become larger in size and transform into primary spermatocytes. These diploid primary spermatocytes enter meiosis to produce haploid spermatids. One primary spermatocyte enters meiosis-I and produces two secondary spermatocytes. These secondary spermatocytes are haploids. Each of these two secondary spermatocytes enters the meiosis-II and produces two haploid spermatids. In this way, one diploid primary spermatocyte produces four haploid spermatids.
