Answer:
The climate in that area is different today then when tropical plants and animals lived there
Explanation:
The climate on Earth is constantly changing, and there's numerous factors that contribute to it. The climate can shift from being warm and wet, to cold and dry relatively quickly, thus changing the flora, fauna, and the landscape as a whole. It is no wonder that tropical plants and animals are found in the fossil records in the northern part of Texas, as in the past this region has been dominated by warm and wet climate. That enabled the development of a biome that supported tropical plants and animals. That didn't lasted forever of course, and the climate changed, so Texas became a place with more temperate climate with relatively small amount of precipitation, resulting in changes of what types of animals and plants live there.
B. The existence of homologous structures
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carbon date then figure out what species
The gas particles are freely moving because they aren't tightly arranged together.
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The answer is: lipidic balance, or also called lipid profile (or lipidic profile).
The lipid balance allows measuring the different lipid components (listed before) present in the blood to assess the atherogenic risks of a patient to take preventive measures (eating habits, lifestyle) or appropriate therapeutic.
Depending on the case, only a few parameters or all can be done. This assessment is analyzed over a long period through several measures (at least once a year starting to 40 years old, even not-obese people) to assess the cardiovascular risk.