One of the changes in development and specialization that did not happen in primitive mammals was the increase in stomach capacity. The specialization of teeth and the lower jaw are two important modifications of the primitive mammals. Also an increase in size and brain capacity are two crucial modifications of the early mammals.
D. The cytoplasm slides and forms a pseudopodium in front to move the cell forwards.
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<em>The number of flights performed globally by the airline industry increased steadily since the early 2000s and reached 38.9 million in 2019. However, due to the coronavirus pandemic, the number of flights dropped to 16.4 million in 2020.</em>
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