Some diseases require only one vaccination that lasts forever. Others require repeated vaccinations. Why might a vaccination like the flu vaccine only last a short time? A. The virus is more easily transmitted. B. The virus mutates much more rapidly. C. The virus is less dangerous. D. The virus is much smaller.


Answer 1




The virus mutates much more rapidly.  Flu virus are mainly compose by two proteins that gives it the pathogenic power: Hemaglutinnun and Neuraminidase.  The first one is a antigenic glycoprotein that is responsible for the union to the infected cell and there is a great variety, that makes difficult to create a vaccine.

Answer 2
Answer: The answer is B because the Flu mutates thats why we have to get more flu shots 

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What makes a plant cell wall different from that of fungi, for example?


Fungi have no roots, stems, leaves, bark, etc. Fungi cell walls are made of chitin and other polysaccharides, not cellulose (Plants) or protein (Animals). Fungi reproduce by producing spores which are little more than a fragment of the parent fungus cell.

3. Seasonal changes on Earth are primarily caused by the
A) parallelism of the Sun's axis as the Sun revolves
around Earth
B) changes in distance between Earth and the Sun
C) elliptical shape of Earth's orbit around the Sun
D) tilt of Earth's axis as Earth revolves around the


The key cause of the changes in the Seasons of the Earth would be:

D). tilt of Earth's axis as Earth revolves around the Sun.

What are Seasonal Changes?

Seasonal changes are described as the changes in the seasons that are produced due to the association between the Sun and the Earth.

The earth takes a revolution throughout the year around the sun which results in the variation of the seasons throughout the year.

The key cause behind it is its tilted position at the degree of 23.5 which makes a particular area to be distant from receiving the sunlight adequately.

Thus, option D is the correct answer.

Learn more about "Seasons" here:

The answer you are looking for is D


Thermophiles are organisms which thrive in extremely high temperatures. What adaptations must these archaea make in their cellular components to allow them to function in this environment?



They have more bonds (ionic, vdW, polar, peptide, hydrogen) and a thicker phospholipid bilayer than their similarly-structured heat-intolerant counterparts-DNA - two bonds between adenine and thymine, three bonds between cytosine and guanine, MORE C-G PAIRINGS2.


A group of organs that work together to perform specific activities for an organism


Organ system is the answer according to me if it is one word question


organ  a group of tissues that work together to perform specific activities for an organism

Tissue   a group of cells that are similar in structure and function

organism a living thing that carries out the processes of life

Cell the basic unit of life for all organisms

Organ system  a group of organs that work together to perform specific activities for an organism

Explanation: have a super day!!!

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