Pathogens are transmitted in only two ways: by direct contact and by vectors.
a. true
b. false

False

Explanation:

Pathogens can be transmitted in many ways. It can spread by direct contact, indirect contact, or by vectors.

The mode of transmission can be skin contact, airborne particles, touching a surface, bodily fluids, touched by an infected person.

The mode of transmission can be vector that carries disease and helps in disease transmission.

So, the pathogens can be transmitted by direct contact, indirect contact or by vectors and by many more ways.

explanation:

the sequence of amino acids in a protein determines its function. the dna sequence of a gene determines the amino acid sequence of the resulting protein. thus, any changes in dna sequence can result in changes in protein function. this is called a mutation.

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