What are the two main functions of the choroid layer, located behind the retina in humans?
What will be an ideal response?
To supply blood to the retina and to absorb stray light so that it is not reflected inside the eye
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A water sample from a hot thermal vent contained a single-celled organism that had a cell wall but lacked a nucleus. What is its most likely classification?
A) Eukarya B) Archaea C) Animalia D) Protista E) Fungi
The most important advantage of sexual
reproduction is related to
a. increased production of offspring. b. avoiding predators. c. avoiding harmful mutations. d. producing offspring identical to the parents. e. the advantage of having two sexes
A cow with black and white patches is produced from a white bull and a black cow. This is an example of
a. incomplete dominance. b. Codominance. c. dominance/recessive trait. d. Pleiotropy.
In the F2 generation of the above cross, which of the following phenotypic ratios would be expected?
A) 9:3:3:1 B) 9:4:3 C) 1:1:1:1 D) 1:1:1:1:1:1 E) 6:3:3:2:1:1