Vocabulary list
zygote - a single cell that develops into a
person or animal, formed by the joining together of a male and a female gamete (= a cell that is provided by each parent)
blastula - a hollow sphere of cells
Animals that reproduce sexually begin life as a zygote. The zygote undergoes a series
of divisions to form a blastula, a
hollow ball of cells. The blastula folds in on itself, forming a single opening
called a blastopore. The blastopore
leads to a central tube that becomes the
digestive tract. A protostome is
an animal whose mouth is formed from the blastopore. A deuterstome is an animal whose anus is formed from the blastopore.
The anus is the opening through which wastes leave the digestive tract.
During early development, the cells of most animal
embryos differentiate into three layers, called germ layers. The endoderm
is the innermost germ layer. The mesoderm
is the middle germ layer. And the ectoderm
is the outermost germ layer.
Answer the questions:
What is the first stage of a living being that starts his life as a result of sexual activity?
How is digestive tract formed?
Can you name three germ layers?
Useful information
ОтветитьУдалитьWell, thank you for the information.
ОтветитьУдалитьZygote is the first stage of living creatures that reproduce sexually.
ОтветитьУдалитьThe digestive tract is formed from blastopore
Three germ layers - mesoderm, endoderm and ectoderm
very interesting.
ОтветитьУдалитьVery useful information🌸
ОтветитьУдалитьUseful information
ОтветитьУдалитьVery interesting information.
ОтветитьУдалитьVery interesting
ОтветитьУдалить