The answer is convergent evolution.
<span>A convergent evolution is a phenomenon of independent evolution of
similar traits in species that are in different lineages. These traits are called analogues structures. They are similar in form or function but were not present in the last common ancestor of
those species. So, t</span><span>he appendages of cockroaches and turtles are analogues structures with the similar function - creeping movements, and they are the result of the convergent evolution.</span>
During meiosis crossing over occurs at the pachytene stage, when homologous chromosomes are completely paired. At diplotene, when homologs separate, the sites of crossing over become visible as chiasmata, which hold the two homologs of a bivalent tighter until segregation at anaphase.
B. The sperm cells swim to the egg cells through their watery surroundings.
Study of fossils has led to important new understanding about how life evolved on earth and about diseases, both ancient and modern. Fossils also help us understand past climates, including ice ages and periods that were warmer than our present climate. Knowledge from the study of fossils is helping geoscientists understand global warming and its effects. By studying the catastrophic extinction of the dinosaurs and many other life forms at the end of the Cretaceous Period, geoscientists have gained insight into the evolutionary implications of impacts by extraterrestrial objects. Investigating the physical and chemical characteristics of fossil organisms that lived during times of drastic climatic change helps us understand the implications of the changes we are making in our own environment. <span>Information about Earth history, practical help in finding energy resources, and information that helps us anticipate the effects of possible environmental changes are not the only benefits derived from fossils. hope this helps :)</span>
Answers:
1. C is correct answer. Y is a liquid because it fills up to the entire container.
2. C is correct answer. The two substances are the same because their intensive property is the same.
Hope it helped.
-Charlie
