D. Immediately begin 4. No one responds to your ye!! for help. After about 2
minutes, or 5 cycles of compressions and breaths, you
should:
a. Perform CPR until you are too tired to continue.
b. Stop CPR and wait for trained professionals to arrive.
c. Leave the child to go call 911, get the AED and quickly
return.
d. Recheck response and breathing.
CDD

i dont know this but ask your teacher for !

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.