How do molecular and morphological data evidence clash in the classic example of cichlid fishes in African lakes?

Visit the SHARK LAGOONhttps://explore.org/livecams/aquarium-of-the-pacific/shark-lagoon-cam1. Observe these sharks as they swim by. How can you tell which are males and which are females?2. Observe the sand tiger shark, which is in the same order as the white shark, i.e., a mackerel shark. How many gill slits does it have?3. Sharks are able to detect bioelectric fields of their prey. What other adaptations (morphological, behavioral, or physiological) do these sharks possess that make them excellent predators?

Why is it that the body temperatures of terrestrial poikilotherms can substantially exceed air temperature but body temperatures of aquatic poikilotherms are generally very close to water temperature?

Given that the ligament holding valves together readily decays, how do you expect to find intact bivalves in the fossil record? What do you expect their valve orientation with the substrate to look like? How might this affect morphometric studies-- i.e. is it always possible to take measurements in three dimensions?