Correct Answer: B. Salmonella typhi

Correct Answer: B. Enamel

Correct Answer: B. I only

Explanation

As the disorder is X-linked and the subject is male, he only received an X-chromosome from his mother. Therefore, the allele for the disorder must have been inherited from his mother. However, this does not mean that the mother expressed the disorder herself, as she could have the dominant allele in addition to one recessive allele.

Correct Answer: D. they are neighbours

Correct Answer: D) Gizzard

Explanation

Birds have a unique digestive system that allows them to break down and digest their food efficiently. The alimentary system, or digestive system, of a bird is made up of several parts including the crop, stomach, cloaca, rectum, and gizzard. The question is asking which part of a bird's alimentary system is responsible for grinding food. The correct answer is Option D, the gizzard. The gizzard is a muscular organ that uses small stones and grit to grind food into smaller particles, making it easier for the bird to digest. The crop, stomach, cloaca, and rectum all play important roles in the digestive process, but they do not specifically grind the food like the gizzard does. The crop is a storage area where food is temporarily held before moving to the stomach. The stomach secretes enzymes and acids to break down proteins and other nutrients in the food. The cloaca is a common opening for the digestive, reproductive, and urinary systems. The rectum stores waste before it is eliminated from the bird's body. Understanding the different parts of a bird's alimentary system is important for studying avian biology and can also inform our understanding of other animals' digestive systems.

Correct Answer: D. alveoli

Correct Answer: C. Glucose

Correct Answer: C. glomerulus and Bowman's capsule

Correct Answer: B) Hawks

Explanation

This question is asking about the food chain consisting of grasses, grasshoppers, lizards, snakes, and hawks. The food chain represents the transfer of energy and nutrients from one organism to another. In this food chain, grasses are eaten by grasshoppers, which are eaten by lizards, which are eaten by snakes, which are eaten by hawks. The question is asking which organism is the least in number in this food chain. The answer is option B, hawks. This is because as we move up the food chain, the number of organisms decreases. There are generally fewer predators at the top of the food chain because they require a large amount of prey to sustain themselves. It's important to note that the food chain is not always a straight line from one organism to another. It can be more complex and involve multiple organisms at each level. Also, the food chain can be affected by various factors such as human activities, environmental changes, and natural disasters. To learn more about food chains and their importance in ecosystems, please see the relevant sections of your recommended textbooks.

Correct Answer: C. pancreas