Tyra designed an experiment to demonstrate an annular solar eclipse. the steps of the experiment are listed below.
place a light bulb on a stand.
stick a pencil into a small styrofoam ball.
switch on the light bulb and darken the room.
stand facing the light bulb.
hold the pencil with styrofoam ball very close to the eye.
observe the light bulb without moving the eye and styrofoam ball.
tyra's experiment has a flaw. which of these statements best describes a method to correct the flaw in tyra's experiment?

place the light bulb behind the observer.
clamp the styrofoam ball behind the light bulb.
move eye towards the right to observe the light bulb.
hold the styrofoam ball at arm's length from the eye.

in situ hybridization has been widely used for research applications, including clinical cytogenetics, gene mapping, tumor biology and studies of chromosome evolution.

humans, along with other animals and plants, have linear chromosomes that are arranged in pairs within the nucleus of the cell. the only human cells that do not contain pairs of chromosomes are reproductive cells, or gametes, which carry just one copy of each chromosome.

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 : )

(nitrogen fixation) will be your answer sorry if im wrong