The following events are part of endochondral ossification. In which order do they occur? • Formation of the primary ossification center
• Osteoclasts break down the spongy bone to create marrow cavity.
• Cells from the perichondrium differentiate into osteoblasts.
• Formation of the secondary ossification centers
• Calcification of matrix surrounding chondrocytes
A.)1,423,5
B.)5,3,1,2,4
C.)1,5,3,4,2
D.)5,3,1,4,2

What is the compliment dna strand to the following sequence: ttgactaggcta

Biology ! the conversion of inorganic carbon to organic carbon by plants during photosynthesis is known as _[blank]_. filtration immigration reabsorption primary production

Astudy by solloch and et. al., in 2017, gives the map above which shows the frequency of alleles with a ccr5-delta32 mutations over 87 different countries. this mutation deletes the presence of a co-receptor (ccr5) on the outside of human t-cells (lymphocytes). some viruses, such as the one responsible for the black death and human immunodeficiency virus (hiv), require this receptor for attachment to host cells during the infection process. the black death was an epidemic that passed over northern europe during the 14th century killing nearly 60% of europeans. according to this information, which explanation best explains why northern europeans show a greater immunity for hiv than some other parts of the world?