Vitamins help them function as fats.
Answer:
Birds require high levels of oxygen and, therefore, high rates of gas exchange due to flight demands. Avian resting oxygen consumption is high compared to that of mammals and other vertebrates, and this increases even more during the flight.
Explanation:
Compared to mammals, birds have specific adaptations of the respiratory system that result in higher levels of oxygen exchange.
Answer: The correct answer is black because the product of its side and mass is lower.
Explanation: Density of a substance is defined as the mount of matter that can be stored in a given volume.
Mathematically,

As, density is inversely proportional to the volume of the substance.
The substance will be more denser if it has less volume and it will be less denser if the volume is more.
We are given two cubes having different sides.
Volume of the cube is calculated by using the formula:

where, a = side of the cube.
Black: The side of this cube is 2 and volume will be =
Yellow: The side of this cube is 3 and volume will be =
As, the volume of black cube is less. So, this cube will be more denser.
Density of black cube: 
Density of Yellow Cube: 
Hence, black cube will be more denser because the product of its side and mass is lower.
It is true. The Mauna Kea Silversword is highly endangered flowering plant endemic which is Hawaii island. Mauna Kea silversword is a member of the silversword alliance. The group has fifty species in the three genera of endemic Hawaii islands.
It is an erect, monocarpic single-stemmed, basically wordy herb, spirally arranged. The leaves are being covered with a dense layer of long silvery hairs, the leaves have essential ability to store water as a gel in the intracellular spaces whereby the other plants leaves they contain air in them.