Biology Questions
Explore questions in the Biology category that you can ask Spark.E!
the single mammalian sperm that finally enters the egg carries its genetic contribution in a
Facial development begins in the ____ week and is completed in the _____ week
Mesoderm differentiates and divides on each side to form ___________
the sperm DNA had epigenetic markers that were critical in making
Lens placodes will form the future _____
two pronuclei migrate toward each other and the two nuclear envelopes
Primitive pharynx will become the future ________
By the end of the ______ week, the last _____ branchial grooves are obliterated which forms a smooth ________.
Orofacial development occurs at weeks ______
Down syndrome or ________ = extra chromosome number ________ present
Preimplantation period is week...
A specialized group of cells differentiates from ectoderm and is now considered _________
Only the _____ branchial groove gives rise to the mature structures of the _____ and _____
These cells are located in the ________ which extends from the cephalic end to the caudal end
________ develops from neuroectoderm and disperse within the ___________
The _________ is formed by the fourth week and undergoes ________
As it deepens further it is surrounded by _________
How are chromosomal comparisons, bio-geographical distribution, and biochemistry of extinct organisms used in modern classification systems?
Which taxonomic category is higher than the others?
Linnaeus developed two primary kingdoms: Animalia and Vegetabilia. This system was utilized until the discovery of protists. What characteristic(s) of protists made it difficult to keep Linnaeus's two-kingdom system?