Answer the following question given this paragraph: Like the immune systems of other vertebrates, the human immune system is adaptive. If pathogens manage to get through the body's first two lines of defense, the third line of defense takes over. The third line of defense is referred to as the immune response . This defense is specific to a particular pathogen, and it allows the immune system to "remember" the pathogen after the infection is over. If the pathogen tries to invade the body again, the immune response against that pathogen will be much faster and stronger. Q: The third line of defense of the immune system is called? Choices: - the sudden response - the asymptomatic response - the malignant response - the immune response A:
the immune response
(Question)
Answer the following question given this paragraph: Plants may have colonized the land as early as 700 million years ago. The oldest fossils of land plants date back about 470 million years. The first land plants probably resembled modern plants called liverworts , like the one shown in Figure below . Q: The oldest fossil of land plants date back how many millions of years? Choices: - 520 million years - 350 million years - 430 million years - 470 million years A:
(Answer)
470 million years
Ques: Answer the following question given this paragraph: The orbicularis oris is a circular muscle that moves the lips, and the orbicularis oculi is a circular muscle that closes the eye. The occipitofrontalis muscle moves up the scalp and eyebrows. The muscle has a frontal belly and an occipital (near the occipital bone on the posterior part of the skull) belly. In other words, there is a muscle on the forehead ( frontalis) and one on the back of the head ( occipitalis), but there is no muscle across the top of the head. Instead, the two bellies are connected by a broad tendon called the epicranial aponeurosis, or galea aponeurosis (galea = "apple"). The physicians originally studying human anatomy thought the skull looked like an apple. The majority of the face is composed of the buccinator muscle, which compresses the cheek. This muscle allows you to whistle, blow, and suck; and it contributes to the action of chewing. There are several small facial muscles, one of which is the corrugator supercilii, which is the prime mover of the eyebrows. Place your finger on your eyebrows at the point of the bridge of the nose. Raise your eyebrows as if you were surprised and lower your eyebrows as if you were frowning. With these movements, you can feel the action of the corrugator supercilli. Additional muscles of facial expression are presented in Figure 11.8. Q: The orbicularis oris is a circular muscle that moves the lips, and the orbicularis oculi is a circular muscle that does what? Choices: - pressure the eye - opens the eye - moisturizes the eye - closes the eye A:
Ans: closes the eye
(Q).
Answer the following question given this paragraph: The first line of defense includes mechanical, chemical, and biological barriers. Q: The first line of defense includes mechanical, chemical, and which other barrier? Choices: - independent - physical - surgical - biological A:
(A).
biological
Ques:Answer the following question given this paragraph: Nicotinic receptor causes depolarization. Muscarinic receptors can cause both depolarization or hyperpolarization depending on the subtype. Q: Muscarinic receptors can cause both depolarization or hyperpolarization depending on the what? Choices: - strain - gravity - phenotype - subtype A:

Ans:subtype
Answer the following question given this paragraph: Of course, a net external force is needed to cause any acceleration, just as Newton proposed in his second law of motion. So a net external force is needed to cause a centripetal acceleration. In Centripetal Force, we will consider the forces involved in circular motion. PhET Explorations: Ladybug Motion 2D Learn about position, velocity and acceleration vectors. Move the ladybug by setting the position, velocity or acceleration, and see how the vectors change. Choose linear, circular or elliptical motion, and record and playback the motion to analyze the behavior. Q: Of course, a net external force is needed to cause any acceleration, just as newton proposed in his second law of what? Choices: - land - gravity - speed - motion A:
motion