Very short-term bursts of stress can have a beneficial effect on many biological systems, including the system, which is your body's frontline defense against infection and cancer.

a. nervous

b. respiratory

c. immune

d. circulatory

Very short-term bursts of stress can have a beneficial effect on many biological systems, including the immune system, which is your body's frontline defense against infection and cancer.

c

C) Immune

Explanation:

Very short-temr bursts of stress can have a beneficial effect on many biological systems, incuding the immune system, which is your body's frontline defense against infection and cancer.

because they are eaten by the frog and the frog getseaten by the snake and the snake by the eagle

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds