Why do Scienctists believe that mitochondria originated from ancient bacterial cells. a
mitochondria engulfed plastids which perform photosynthesis for the cell.
b
bacterial cell have an internal membrane system
c
mitochondria contain DNA that looks like prokaryotic cell
d
eukaryotic cellular reproduction is similar to prokaryotic reproduction

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

radon is correct hope this