Fraternal twins (dizygotic) result from the fertilization of
a)two eggs and two sperm.
b)two eggs and one sperm.
c)one egg and two sperm.
d)one egg and one sperm.
e)two eggs and one sperm OR one egg and two sperm.
a)two eggs and two sperm.
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The bond between two amino acids is referred to as a(n) ____ bond
Some help with this please? Thanks.
Two species of flowering plants live together and flower at the same time. They do not hybridize
because they each have a unique pollinating insect. This is an example of a
a. genetic bottleneck. b. sympatric speciation. c. hybrid zone. d. postzygotic barrier. e. prezygotic barrier.
Which layer(s) of the digestive tract in mammals directly contacts the lumen?
a. mucosa b. muscularis c. submucosa d. serosa e. serosa and muscularis
When two species, such as bees and angiosperms, both benefit from their interdependent relationship, this is referred to as ________
Fill in the blank(s) with correct word