Why Whales Lose Their Legs Lab

Firstly the main apparatus was set up (a retort stand with a bosshead and clamp attached)

The evolutionary path of a whale is a fascinating process of a terrestrial mammal that evolves into a marine mammal. This evolutionary path started with one of the earliest ancestors called “Pakicetus”. A Pakicetus was discovered to be a land animal with four legs that had teeth as carnivores. It skull structure was long, but this organism didn’t look like any marine animal. The scientist then discovered that on the skull’s ear region it was surrounded by a bony wall. This feature on an organism only was distinct from one type of species, scientist discovered that this animal “Pakicetus” was an ancestor of a whale. By comparing the early whales Pakicetus to the next generation of ancestors Ambulocetus, the Ambulocetus whale looks more like

The origin of modern day whales, a mystery that has puzzled paleontologists for years, may have just been solved with the discovery of an ankle bone. This discovery might sound simple and unimportant, but the bones of these ancient animals hold many unanswered questions and provide solid proof of origin and behavior. The relationship between whales and other animals has proven to be difficult because whales are warm-blooded, like humans, yet they live in the sea. The fact that they are warm-blooded suggests that they are related to some type of land animal. However, the questions of exactly which animal, and how whales evolved from land to water, have remained unanswered until now.

Length and Weight: The average length of a blue whale is 75 - 80 feet (23 - 24 meters) and these long marine mammals can weigh up to 200,000 pounds (90,000 kg). Whales in the southern hemisphere are generally larger than those in the northern hemisphere. One whale captured in the southern hemisphere measured 110 feet (33 meters) in length. Females are usually larger than males of the same age. Fins: A small triangular-shaped dorsal fin is located on the blue whale's back. This fin measures only one foot in height. The shape and size of the dorsal fin can be very different for each whale. The whale's flippers are short and the tail is broad and triangular in shape. During the summer feeding period, a blue whale eats about 40 million krill each day, amounting to about 3,600 kg (7,900 pounds). During the other 8 months of the year, it lives of stored fat not eating anything.The blue whale feeds by using its long flexible throat grooves to expand its throat and draws in water laden with the prey, then forces the water out through its baleen plates. The whale then swallows after the baleen plates filter out the prey organisms (most likely

Step 3: Use the thermometer to identify and record the temperature for room temperature, in your refrigerator, in your freezer, and then research the temperature of boiling water (do not take this temperature) and record them in Table 2.

Each student got a white tub and filled it up with tap water from the sink. Students were paired with two or three other people and formed their groups. Each group got 1 stopwatch, 1 thermometer, and also learned how to each other’s pulse. The temperature of the water used from the sink were adjusted beforehand to about 23°C; room temperature. Water temperature was not re-adjusted to be hotter or colder.

9) Trial E: Remove the syringe and empty the beaker. Add a Thermometer to the beaker. Add 200 mL of Room Temperature water to the beaker and heat with a Bunsen Burner until it reaches 100° C. Remove the Bunsen Burner. Repeat Steps 5 & 6.

* Record how long it takes for each Ice Cube to melt completely, taking progress notes as you go. For instance, the percentage of the ice cube that has melted at 5 minutes, 20 minutes, etc.

1. Fill up a 200ml beaker with tap water and then pour it into the designated jar

4.Measure 35mL of warm water and add them into each of the 4 test tubes at about roughly the same time. It is essential that the water is warm. Do not seal the test tube.

seltzer tablet into it, and as I did so I started the timer. When Alka

The Lab One was done on Laboratory Techniques and Measurements. The first experiment with my Lab partner; we got opportunity to experiment how to conduct measurements in length by using metric conversion. We started in cm units and changed into mm by x10, and moving decimal point x1 to right. To find in meter we moved from cm to meter two decimal points to the left or double check our self divided by 100 and all records in data table 1. The second experiment was to measure temperature of how cold and hot tap water can be by using thermometer in Celsius units. From this experiment, gained knowledge that tab water doesn’t boil to 100 Celsius related to containing different

In the wild, it is unheard of to see orcas with collapsed dorsal fins but when people go to parks like SeaWorld every single orca has a collapsed fin. This is primarily due to their confined living environments limiting them to swim in small circles and the shallow tanks force them to spend more time at the water’s surface. If the whales are constantly above water, gravity will eventually cause their fins to collapse as they mature because there is no support of water to keep them up.

4. Remelt the contents of the tube and add the counterpart component based on the given schedule. Ask the demonstrator to adjust the cooling water between mixtures. During the experiment, record and plot the data obtained for all mixtures listed. The experiments are stopped as follows:

The results of the experiment supported my hypothesis, which was that the foot without the sock would transfer more heat to the wooden surface than one with a sock. The foot with the sock transferred 1-2° less heat because the wool sock acted as an insulator. This trapped the heat in the sock and let less escape to the floor. One question that was brought up when doing this experiment was “why did one participant transfer more heat to the floor than the other?”. In future experiments showing relationships with heat transfer, using more than one body part would lead to more accurate results. Since feet are at the end of our limbs they don't have much muscle that produces heat. This means they cool down faster and the temperature of them can vary from person to person. Using several different parts of the body would give more results increasing the accuracy of the