Trisha is learning how to do a first-aid procedure known as CPR. She is practicing using a mannequin, or a model of the top half of the human body. What is one limitation of a CPR mannequin?

it is not possible to check for a real pulse on a CPR mannequin

Explanation:

Based on the information provided within the question it can be said although extremely helpful, one limitation that CPR mannequins have is that it is not possible to check for a real pulse on a CPR mannequin. Being able to check the pulse of the victim is extremely important as it allows you to see how serious the victim's condition is and take appropriate measures.

they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

explanation:

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.