Bacteria are very small single-celled organisms that lack a nucleus. although bacterial cells are less complex than the cells that make up the human body, bacteria are very important to human health. which statement best summarizes how bacteria affect human health?
a)
bacteria cause disease in humans.
b)
bacteria are beneficial to humans.
c)
bacteria rarely affect human cells because they are so much smaller.
eliminate
d)
some bacteria are beneficial to humans and some bacteria are harmful.

The correct answer is -

D) Some bacteria are beneficial to humans and some bacteria are harmful.

Bacteria are prokaryotic organisms that do not contain a defined nucleus and membrane bound subcellular compartments (called cell organelles).

Certain bacteria are beneficial to human lives whereas other bacteria are harmful.

For example - Lactobacillus bacteria that is present in the dairy product is useful for the human health as it maintains the gut microbiota, providing good health.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

the answer will be a) proteins i believe