I think it’s carbohydrates or protein
4. Large, circular lily pads are able to float on the water's surface.
Answer: cohesion
Cohesion mean that water attracted to another water. This force will make the water to form a surface tension in the lake. Water lily has a wide and thin leaf which makes it giving a low force per area. If the force applied on the surface is not bigger than surface tension, the leaf will stay float above the water. Surface tension also the reason water spider could walk on water.
5. The temperature of the water is about 5°C, while the temperature of the air is about 21°C.
Answer: heat capacity
Water has high heat capacity. High heat capacity mean that the water will not be easily become cold or hot. It will need more energy to increase/decrease the temperature of the water. This is why the water could keep its temperature much lower than the atmosphere. This will protect the organism inside the water from an extreme temperature change.
In late adulthood, changes in memory may not be inevitable; however, any decline in memory tends to involve episodic memory. Episodic memory is the memory of autobiographical events such as time, places, associated emotions, and other contextual who, when, what, where, why knowledge, that can be explicitly stated or conjured. It is the collection of past personal experiences that occurred at a particular time and place. Examples of episodic memory include, the memories of what you ate for breakfast, your first day of college.
The femur is the longest bone.
Sedimentary rock is formed as layers of sediment are layered on top of the already existent sediments, lower layers of sedimentary rock, and fossils they contain, or normally older than the upper layers. Relative dating allows paleontologists to determine whether a fossil is older or younger than other fossils. To help the paleontologists figure out the relative ages of the fossils, they use index fossils. Index fossils are distinctive fossils used to establish and compare the relative ages of rock layers and the fossils they contain. Useful index fossils can be easily recognized and will only occur in a few rock layers, but these layers will be found in may different places. This means the organism only lived for a short period of time and that the organism was widely distributed.