I think the correct answer would be A. The yolk sac becomes the placenta. It is membranous sac that is attached to the embryo. It provides all the nutrition and the blood cells needed by the embryo. It is also called the umbilical vesicle.
Answer:
It is composed of protein
Explanation:
DNA is the stored form of the genetic material in living organisms. DNA is a long chain polynucleotide made up of nucleotide subunits. The nucleotides are monomers that comprises of a five carbon sugar (Deoxyribose), a phosphate group and nitrogenous bases (Adenine, Guanine, Cytosine and Thymine). A DNA molecule has segments that holds the information to build an organism and pass genetic traits to offsprings. This segment is called GENE.
However, before this genetic material can be passed on to an offspring or be used in an organism's growth and development, it needs to divide into the cells that require it. Before it can divide into the cells, it needs to be replicated in order for each cell it is dividing into, to have an equal and correct number.
The DNA is also capable of change in its nucleotide sequence so as to achieve genetic variation.
Explanation:
Chlorophyll is any of a group of green pigments that are found in the chloroplasts of plants and in other photosynthetic organisms such as cyanobacteria.
Answer:
the presence of hollow bones
Explanation:
hollow hollow bones are one of the adaptive features in birds which enables them to fly.
The rock cycle is a model that describes the formation, breakdown, and reformation of a rock as a result of sedimentary, igneous, and metamorphic processes. All rocks are made up of minerals.
These rocks change over hundreds of years in the six steps of the rock cycle: Weathering & Erosion. Igneous, sedimentary, and metamorphic rocks on the surface of the earth are constantly being broken down by wind and water. Wind carrying sand wears particles off rock like sandpaper.