Question

Which of the following is a true statement concerning antibiotic resistance in bacteria?

Group of answer choices

It is created by an increase in antibiotic use

Antibiotic use creates new mutations leading to antibiotic-resistant strains

It must be present in the bacterial population before the introduction of an antibiotic causes it to increase in frequency

Antibiotic resistance is NOT a major concern

Most poison dart frogs produce 5-10 eggs in each clutch. Poison dart frogs producing fewer, or more, that this have reduced fitness. Which of the following terms best describes this situation?

Group of answer choices

directional selection

disruptive selection

sexual selection

stabilizing selection

Both ancestral birds and ancestral mammals shared a common ancestor that developed ideal forelimb bones for walking on land. Ducks (which are birds) and platypuses (which are mammals) have bills that help them feed in the water. What term best describes the relationship of the bones in the forelimbs of ducks and platypuses, and what best describes the bills of ducks and platypuses?

Group of answer choices

convergent evolution; convergent evolution

homologous structures; homologous structures

convergent evolution; homologous structures

homologous structures; convergent evolution

Answer 1

1. Ans :  It must be present in the bacterial population before the introduction of an antibiotic causes it to increase in frequency.

Antibiotic resiatance is a natural phenomenon in bacteria acquired by evolution of acquired by natural selection.

2. Disruptive selection

Usually most poison dart frogs produce 5-10 eggs in each clutch. When the poison dart frogs producing fewer, or more, that this have reduced fitness because of some selction pressures.

3. convergent evolution; convergent evolution

Both ancestral birds and ancestral mammals shared a common ancestor that developed ideal forelimb bones for walking on land. Ducks (which are birds) and platypuses (which are mammals) have bills that help them feed in the water. The relationship of the bones in the forelimbs of ducks and platypuses, the bills of ducks and platypuses are strictly convergent evlution.