<span>They do not possess any skeleton at al</span>
Answer:
a) Teeth arose from the rough scales of ancestral sharks.
b) Skeletal developments leading to the amphibian movement onto land probably evolved from lobe-finned fishes.
d) The anterior gill arch formed the basis for the evolution of the vertebrate jaw.
Explanation:
The animals we know today have physical characteristics that are evolutionary adaptations of characteristics of their ancestors, which have undergone a series of evolutions and modifications over the years giving rise to new species that have resulted in the species we know today. This process of evolutions and adaptations also happened with the ancestral species of fish, which allowed that today, they had characteristics such as teeth and jaws. Many of these evolutions occurred even in different species, such as the evolution that allowed the amphibians to have a skeleton, which evolved from the spine fins of fish.
Answer:
<em>If a cell in your body has 46 chromosomes, it is said to be diploid.</em>
Explanation:
A diploid cell can be described as a cell that has chromosomes present in it in the form of pairs. There are 23 pairs of chromosomes in the autosomal cells of a human body. This means that in total there are 46 chromosomes in the autosomal cells.
However, the sex cells of the humans are haploid. The sex cells of humans have 23 chromosomes. The male and female sex cells unite to form diploid cell.
It is important to study the cell in order to learn about DNA is that there many different processes that help to keep a cell running. In order to know DNA, you need to familiarize yourself with mRNA, tRNA, and rRNA to learn the process of transcription and translation- two very important processes in DNA.
