Question

1. mammals utilize ______ fertilization. unisexual external internal asexual 2. what characteristics do all birds share? select all that apply. they have beaks. they have feathers. they are endotherms. they have front legs that have been modified into wings. they have hind legs that they use for walking and perching. they are ectotherms. 3. why are mammals teeth unique? they are all used to suck blood of their host. they are all used to capture prey. different teeth are used for different tasks. they are all used for tearing flesh.

Explanation:

1. Mammals have internal fertilization as the sperm fertilizes the egg inside the female's body.
2. Birds are characterized by having beaks, feathers, being endotherms (able to maintain a constant body - temperature), front legs modified into wings, and hind legs for walking and perching.
3. Mammals have different types of teeth (incisors, canines, premolars, molars) which are specialized for different tasks like biting, tearing, and grinding.

Answer:

1. C. internal
2. A. They have beaks., B. They have feathers., C. They are endotherms., D. They have front legs that have been modified into wings., E. They have hind legs that they use for walking and perching.
3. C. Different teeth are used for different tasks.