Plan an investigation to answer the following question : ‘is the breathing rate of smokers different from that of non smokers’ include at least two factors which should be kept the same in order to make it a fair test

well, you see. the answer to your question is quite simple. the thing that is big, powerful, and over 9,000 is your mom.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )

producers: apple trees, potatoes, carrots, grains, acorns, cabbage, grass, corn, lettuce

consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls

the actual answer was 160934