answer:The paleontologists' objection that no placental fossils have been found from before the end of the Cretaceous shows that this may not be the case. This is a discrepancy between the molecular phylogenetic studies' suggestion of divergence 100 to 85 million years ago and the actual fossil evidence found from the early Paleocene, after the extinction of the dinosaurs.

answer:Mr. Johnson decided to go to the Job Center tomorrow to get more details about the job so that he can talk it over with his wife.

answer:Answer: II. Megan is a friend to others. While both options may be true, choosing option II, "Megan is a friend to others," is a more fitting continuation of the sentence provided. This selection emphasizes the camaraderie and supportive nature of Megan, which gives context to why Natalie is stopping by to congratulate her. It suggests that Megan's interpersonal relationships and her friendships are essential components of her character and are highly valued by her friends, like Natalie. Moreover, it highlights the mutual appreciation and affection within their social circle, creating a rich tapestry of connections among the individuals involved. Option I, on the other hand, focuses on Natalie's ability to be a friend, which is not directly related to the subject matter of the original sentence. While it is a nice sentiment and could be a valid addition to the story, to maintain the flow of the narrative and keep the focus on Megan's importance, it is better to choose option II. In summary, Megan's friendly nature towards others plays a vital role in her social circle – an attribute that is appreciated and celebrated by her close friends like Natalie. This sense of camaraderie and mutual support is what brings Natalie to congratulate Megan on this important day, reflecting the importance and strength of their bond.

answer:The type of crab known for using the discarded shells of other sea creatures is called a hermit crab (from the superfamily Paguroidea). Hermit crabs are fascinating crustaceans that display unique and adaptive behaviors in order to survive in their natural habitats. Hermit crabs are primarily marine animals, with some species that inhabit the intertidal zones, while others can be found in deeper waters. There are also terrestrial varieties, commonly known as land hermit crabs, which are popular as pets. Over 800 different species of hermit crabs are known to exist, and they can be found in oceans all around the world, from the shallowest coastal waters to the deepest ocean trenches. One of the most defining characteristics of hermit crabs is their utilization of abandoned, empty shells for protection. Since hermit crabs have soft, exposed abdomens, they rely on the discarded shells of gastropods (typically, snail shells) to safeguard themselves from predators, dehydration, and other environmental threats. By doing so, they have evolved a unique form of mutualism with other sea creatures, contributing to the recycling of shells and the reduction of waste in marine ecosystems. Hermit crabs have adapted to this shell-dwelling lifestyle in several remarkable ways. For example, their abdomens are asymmetrical so they can fit snugly into the spiral shape of a snail shell. They also have specialized appendages, known as uropods, which help them hold onto the shell. As hermit crabs grow, they outgrow their current shells and must search for a new, larger one. They perform an activity known as "shell shopping", where they inspect potential shells by carefully examining the interiors, determining whether it's the right size and shape. Once a suitable shell is found, they perform a quick and agile maneuver to switch their home, exposing their vulnerable abdomens for only a brief moment. In some instances, hermit crabs participate in a collective shell exchange, whereby several crabs line up next to each other in size order and swap shells. Hermit crabs exhibit other intriguing behaviors as well. They are social creatures that often form groups, sometimes comprising hundreds of individuals. They communicate using a variety of methods, including chemical cues, physical contact, and audible chirping sounds generated by their exoskeleton. Some hermit crab species have even formed symbiotic relationships with anemones, attaching them to their shells for added defense and camouflage. In conclusion, the type of crab known for using discarded shells of other sea creatures is the hermit crab. Exhibiting unique adaptations, intriguing behaviors, and an essential role in marine ecosystems, hermit crabs are a fascinating group of crustaceans that highlight the resourcefulness and adaptability of the natural world.