Biology Questions
Explore questions in the Biology category that you can ask Spark.E!
Fertilization restores the ____ number of __ chrimosomes
_____ diffuse across fetal blood vessels, and are carried to and from the fetus through the _____
The placenta provides ____ & ____ and removes ____
Around __ hours after fertilization, the zygote undergoes its first mitosis and cell division
Sperm and eggs are each ___ and wash normally have ___ chromosomes
As an embryo develops, the ____ will begin to grow into the uterine wall
The blastocyst attaches to the ____ around day _ and is fully implanted by day __
______________________ classified organisms into Broad groups
Carolous (carl) ___________________: swedish botanist. 1750's. System based on organisms form or structure. _________________________________________
binomial nomenclature: each organism given____________________
until the mid-1700s organisms were given long descriptive names in Latin- "_________________"
________________________: A method of classification in which the relationships between organisms are based on selected___________________ ___________________________
convergent evolution: two or more different species evolve, similar features(_______________________ structures) because they live in or occupy similar_________________________/______________.
Cladistics can be used to ___________________________________ the sequence in which different groups of organisms evolved
always either_______________________ or _________________________!
similar characteristics may indicate that two species share a __________________ _______________________. Or, may also be evidence of __________________________ _______________________.
there are________________ species named, and described to date.
in kingdom___________________, strong _________________ to hybridization usually exist.
when reproductive barriers between two species are not complete, the two species are usually______________ _____________________.
in practice, the best way to recognize species is by studying the organism's________________\___________________