Which of these modes of transmission require a bodily opening either natural or artificial?

Vectors-These are diseases transmission which involves the piercing of the skin-vectors penetration  e.g by mosquito. ticks.

Air borne which involves entry through the nasal passages, mouth, eyes to reach the body  the respiratory tracts and the blood.

Blood borne diseases are  transmitted from e.g piercing of the skin by  contaminated objects needles, broken glass. If there is an opening in the skin these transmission is also possible.

Sexual can be transmitted through open sores at the genitals.or  use of  contaminated needle by infected subject. Sores in the mouth during kissing may be another route

food borne or water borne needs to enter through natural opening of the mouth to reach the body fluids and the blood through the GIT.

Contact diseases does not necessarily need a direct opening for transmission . rather there should be a direct contact between the infected individual and the other. Sometimes a direct contact between the two is not need. e.g common cold, chicken pox , influenza , etc.  

Explanation:

a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

no u