When compared to amphibians, reptiles have stronger limbs and rotated legs which enable them to carry more body weight.

C. their limb bones are stronger than those of amphibians

Due to the discovery of the fossils of the Archaeopteryx, scientists have hypothesized that birds and dinosaurs share the same ancestor.

E. dinosaurs

E – Passerines.
Perching birds also called passerines, this is the largest order of birds. .Many are song birds. Examples: Sparrows, crows, mockingbirds, cardinals.

E

Both birds and reptiles reproduce amniotic eggs.

D. II and III only

Reptiles do not have gills. Instead, they have well-developed lungs that are used for respiration. They have a dry and scaly skin, and they reproduce terrestrial eggs that are enclosed in four membranes.

E. I, II, and III

The air sacs, which are found in the respiratory system of a bird, ensure that the air goes in a one-way flow. As soon as the air is inhaled by the bird, it goes into the air sacs then to the body cavity and the bones. Once the air goes inside the lungs, the lungs are exposed to oxygenated blood.

D. air sacs

**Birds** are animals that look like a reptile but compared to reptile species they can modulate and regulate their internal body temperature. One interesting characteristic of these species is the presence of feather that covers their body. **Feathers** arise from the bird’s skin, and they can be classified into two types depending on their function.

Two types of feathers
1. **Contour feathers** – Feathers that give lifting force and balance to the bird during their flight.

2. **Down feathers** – Feathers that entrap air to be close to the bird’s body to help them regulate their body temperature (to keep them warm)

Hence, the correct answer is **contour feathers**

D

The large chest muscles found in birds are necessary for flight. They have an enlarged breastbone structure that helps the bird support itself as it propels forward and downward when they fly.

D. The breastbone is small.

According to the table, the fastest time in which the snake reached the food is at 35 seconds. This occurred at a temperature of 27 degrees Celsius.

E. 27 degrees Celsius

According to the results of the experiment shown in the table, the temperature and the snake movement display a negative relationship, wherein if one variable increases, the other variable decreases. In this case, as the temperature went up, the movement of snake became faster; hence, the lesser time it took for the snake to get its food.

B. As the air temperature decreased, the time it took for the snake to reach the food increased.