Answer:
Option). 4-5 days.
Explanation:
Morula is a 4-5 days stage of early embryonic development. It represents a solid ball, having 16 cells, known as blastomeres. In human embryo, differentiation begins with morula stage, along with cleavage to form trophoblast (an outer layers of cell) and inner cell mass.
During development, trophoblast forms embryonic part of placenta and inner cell mass form respective structures of embryo.
Thus, the correct answer is option).4-5 days.
Answer:
Day 4-5
Explanation:
The first cell differentiation occurs when the embryo reaches approximately five days after fertilization, forming the blastocyst.
In this case, the cells on the outside undergo the process of differentiation and become responsible for the formation of embryonic attachments (structures that derive from the embryo's germ leaflets but are not part of the embryo's body, such as the amnion).
In the meantime, those cells that remained inside, also undergoing the process of differentiation, become pluripotent stem cells, which are responsible and capable of forming all tissues.
Previously, when they are still undergoing the process of dividing up to 8 cells, each cell is capable of forming a complete being when inserted into an egg.
By going through the whole process and becoming pluripotent stem cells, they can form all kinds of body tissues, butno longer a complete being.
Answer:
The correct answer would be hydrologic cycle (hydro means "related to water").
Hydrologic cycle or water cycle refers to the cyclic movement of water in an ecosystem.
The physical processes involved in the cycling of water throughout the ecosystem are: evaporation, condensation, sublimation, precipitation, infiltration, and runoff (surface and sub-surface).
Water evaporates from the surface of the earth into the atmosphere where they condense to form clouds. When temperature decreases, the water droplets merge with each other to form bigger droplets which are precipitated in the form of rain.
Water can also precipitate in the form of snow, fog, hail sleet et cetera.
Water fall on the earth surface either infiltrate to form ground water or runoff the surface to from lakes, rivers et cetera.
B) heavy metals such as mercury.
C) nitrogen oxides from automotive exhaust.
D) small particles of smoke and dust in smog.
The correct answer is B) Heavy metals such as mercury.
Explanation:
Heavy metals such as mercury or lead are denser than regular metals, this causes it is common for these metals to be found in the surface of Earth rather than in the air or atmosphere. Indeed, mercury and other similar metals are extracted from the Earth's crust and then used for different purposes. As a result of this, mercury ends up in the surface of Earth or in water sources which causes soil or water pollution. This means mercury is not a common source of air pollution; on the opposite other such as CFCs, nitrogen oxides and smog remain in the air and therefore are sources of air pollution.
Answer:
High tides and low tides are caused by the moon. The moon's gravitational pull generates something called the tidal force. The tidal force causes Earth—and its water—to bulge out on the side closest to the moon and the side farthest from the moon. These bulges of water are high tides.
Explanation:
hope this helps you :)
Answer:
oceans to bulge
Explanation:
The moon appears full when the Earth is between the moon and the sun. In both cases, the gravitational pull of the sun is "added" to the gravitational pull of the moon on Earth, causing the oceans to bulge a bit more than usual. This means that high tides are a little higher and low tides are a little lower than average.