When erythrocytes are in the capillaries of the lungs, O2 diffuses ________ and is bound to ________
Fill in the blank with correct word.
Answer: inward; hemoglobin
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How many chromosomes are found in a single human cell at the end of each of the following meiotic stages? ________ prophase I ________ anaphase I ________ prophase II ________ telophase II
What will be an ideal response?
Viral gastroenteritis that affects people of all ages and usually lasts less than 3 days is caused by
A. herpes. B. hepatitis B. C. norovirus. D. rotavirus.
Although insects and birds both have wings, the structures do not come from the same lineage and these species do not share a common ancestor. This would be an example of ______.
a. a homologous structure b. a vestigial structure c. an analogous structure d. none of the above
Linnaeus classified organisms based on
1.DNA sequences. 2.protein sequences. 3.morphological characteristics. 4.evolutionary history. 5.existing phylogenetic trees.