Jason, a health teacher, explains to his class that for a to be created, the sperm of a male must unite with the egg from a female, a process that takes place during the prenatal period.

Zygote, germinal.

Explanation:

The process in which a sperm of a male fuses/unite with the egg/ovum of a female is known as fertilization which occurs in germinal prenatal period. As soon as sperm reaches female genital tract, it tends to move towards ovum which is present in fallopian tube. After formation of zygote, an embryo(2 cells) is formed by the first cleavage of zygote. After continuous cleavages the embryo is converted into morula (~ 16 - 64 cells)  and then into blastocyst  (~ 128 - 300 cells). The blastocyst then moves to the uterus where it can be implanted so that it could develop further. All this occurs during germinal prenatal period which starts from fertilization and ends with the formation of blastocyst.  

d concave shape of wave rock

explanation:

the concave shape of wave rock is a very good evidence that supports the evolution of earth due to chemical weathering. if we talk about structure of   wave rock, studies have estimated that it is around 2.7 billion years old. it also serves as the foundation of evidence that it was the place where australian continent began to form.

how the structure of wave rock was created?

studies suggest that structure of wave rock was created when the surrounded area was started to weather due to which deposition of material started on the part of land which now contains wave rock.

the structure of wave rock is considered to be one of the best-known landforms in australia. at the height of around 15 cm, there can be found flared slopes which formulate the margins of hyden rock. it is now assumed by geologists that wave rock was created by subsurface water-induced weathering and not by glaciers, waves or wind.

due to deposition of material over the period of long time, the wave rock became tougher and tougher due to weathering from surrounding terrain. this makes it a physical evidence that supports   the evolution of earth due to chemical weathering.

hope it !

yes? sounds right, but you didn’t ask a question.