Antigens are molecules that the immune system recognizes as foreign to the body, and immunology is the study of the immune system. Given these facts, what is one thing studied in immunology among the following options: - illness - antigens - humanism - health - philosophy - resistance - symbology - fever
antigens

(Question)
Cartilage is a tough tissue that contains a protein called collagen, and cartilage cells are called chondrocytes in mature cartilage. Given these facts, chondrocytes contain which type of protein among the following options: - Actin - Keratin - white - allow growth - Collagen - ligt - positive - Hemoglobin
(Answer)
Collagen

Ques: Viruses contain DNA but not much else, and all viruses consist of RNA or DNA and a protein coat. Given these facts, what do viruses contain among the following options: - Mass - DNA - SNPs - RNA - acid - gene - ovum - host
Ans: RNA

(Q).
Echinoderms use pheromones to communicate with each other, and all echinoderms are marine and benthic. Given these facts, marine and benthic species use pheromones to what among the following options: - seed dispersal - produce offspring - life-sustaining - float underwater - defense mechanism - arm each other - communicate with each other - live in marine bays
(A).
communicate with each other

Ques:Threatening behavior by predators causes a porcupine to extend its quills, and puffers are smooth skinned while Porcupines have the characteristic spines or quills. Given these facts, what does a porcupine do with its spines when it's threatened among the following options: - killing insects - Shoot them - kill them - protect them - Extend them - Shed them - Retract them - behave

Ans:Extend them

The surface of a beach is formed by mechanical weathering, and beaches and Sand Dunes Dunes are accumulations of sand blown from the beach by the wind. Given these facts, what makes sand formations among the following options: - potash - wind - fibers - fish - Rain - sea - soils - coral
wind