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Scorpion4ik [409]
3 years ago
11

What leads to long-term immunity in mammals? . . A. Exposure to an antigen . B. Action of an antibody . C. Barriers

Biology
2 answers:
Alborosie3 years ago
7 0
A. <span>Exposure to an antigen

Exposure to viruses and antigens led to the foundation of modern vaccination. Vaccination introduces an antigenic material that helps the ability of the immune system to adapt a specific pathogen, therefore leading to a long-term immunity.</span>
amm18123 years ago
3 0
Letter A. Exposure to an antigen leads to long-term immunity in mammals.
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A(n) _________ scan uses radioactive markers in the blood to monitor blood flow and metabolic activity via x-ray.
olya-2409 [2.1K]

Answer;

-PET scan

A PET scan uses radioactive markers in the blood to monitor blood flow and metabolic activity via x-ray

Explanation;

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7 0
3 years ago
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Imagine you want to identify some organisms in a local pond that you often visit. What key features about such organisms might y
trapecia [35]

Answer:

A: if it’s mobile (is able to move)

C: if it contains cilia (tiny hair-like projections that help it to move and eat)

D: if it is green in color

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Just did it on edge 2020 ;D hope this helps

4 0
3 years ago
Which type of bone is indicated by the arrow? long irregular flat short
nlexa [21]

The answer is long

The bone indicated by the arrow is femur bone. It should be classified as the long bone. Other example for long bones would be tibia and fibula. Short bone would be carpal or tarsal bones. Flat bone could be found in skull. Irregular bone would be the vertebrae or pelvic.

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3. When the Moon is in the position shown, how would the Moon look to an observer on the North Pole?
Bingel [31]

Answer:

i think A

Explanation:

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8 0
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Where can key concepts, words to know, and lesson goals and objectives be found when determining what to study for a test?
Fynjy0 [20]

b.

Chapter introductions

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3 years ago
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