False. An organism's <u>GENOTYPE</u> is represented with letters called alleles, ex: AA, Aa, aa.
All cells have a nucleus :)
Answer:
The type of microscope depends upon the type of sample created.
For observing a sample just to check out its presence of any substance, you can use a simple microscope, and to observe a sample by its morphological features with varying objective lens, you can use compound microscope. To study deep details of the sample, a microscope of high magnifying power like electron microscope can be used.
The correct answer is: choroid and retina.
The choroid is the part of the eye that provides oxygen and nourishment to the retina, which is the light-sensitive part of the eye.