Are explained? or it has steps to solve somethin
Yes unless there procaryotes
The statement in the option #4 is true; Vertebrate fossils are more common than invertebrate fossils. The majority of the fossils are vertebrate skeleton or bones than the invertebrate ones. The options 1, 2, 3, is rather wrong, that leaves you with option #4.
Answer:
Motile cilia and flagella
Explanation:
Both motile cilia and flagella consist of a central bundle of microtubule that is known as axoneme. The axoneme consists of nine doublets microtubules that surround a pair of the central single microtubules. This arrangement of microtubules in the cross secretion of flagella and motile cilia is called 9+2 arrangement.
Each of the 9 doublet microtubules consists of A and B tubules. Additional accessory proteins are associated with the 9+2 microtubules to make then stiff and elastic.
