Answer: gastrula, archenteron, blastospore
Explanation:
a) Gastrulation is a dramatic reorganization of the hollow blastula into a two-layered or three-layered embryo called a gastrula.
b) Invagination of cells into the blastocoel forms a tube called the archenteron.
c) The open end of the archenteron is called the blastospore..
Answer:
Explanation:
A sperm and an egg each contain one set of 23 chromosomes. When the sperm fertilizes the egg, two copies of each chromosome are present (and therefore two copies of each gene), and so an embryo forms.
Compact bone is the denser, stronger of the 2 types of bone tissue. It can be found under the periosteum and in the diaphyses of long bones, where its provides support and protection.
Answer:
sexual chromosome linked characteristics
Explanation:
The sexual crhomosomes are XX (for females) and XY (for males).
The Y chromosome have less genes than the x, because of this, some characteristics are expressed at males and not at females.
Males has only one copy of the gen, carried by the only X chromosome (in this case, the leght of the tail). Nevertheless the females have two copies of the gen, (short and long tail).
So, the fenotype resulting is a dominant characterisitic related to x chomosome (long tail).
