Answer:
Here are the answers:
a. 4 Cell determination as an issue in the *rest is missing*
b. 4 They assumed that different ways of separating an embryo into two parts would be equivalent as far as the fate of the two parts was concerned.
c. 4 I and III only
Explanation:
The passage demonstrates the importance of two factors in the development of an embryo: cleavage planes of division of embryonic cells and cell differentiation.
Cleavage Planes:
Cleavage basically refers to the division of the zygote into a large number of cells called blastomeres. Cleavage planes are geometrical lines or orientations along which cleavage takes place. Since, all embryonic cells are the precursors of some type of body cells, the cleavage planes determine if the cells are adequate for growth and development.
Cell Differentiation:
Cell differentiation is the transition of an undifferentiated cell into a specialized one. For example, stem cells are undifferentiated cells that develop into progenitor cells that mature into a specific cell lineage. For an embryo to regenerate, the presence of adequate embryonic stem cells is crucial. Embryonic stem cells are present in abundance before the gastrulation phase of embryonic development, after which they rapidly start differentiating.
Answer:
B. Native beetle species outcompete the nonnative species.
Explanation:
If native species outdoes the nonnative then the nonnative species cannot become invasive and take over the ecosystem.
I would agree with Kaylan because both fertilizers are indeed dangerous to the environment even though the natural fertilizer has the word “Natural” in front of fertilizer does not mean that it is completely environmentally free from all the chemicals they do have in the Natural Fertilizer.
Evaporation
distillation
filtration
paper chromatography
Bigeochemical cycles are variety of biological, geological, and chemical processes.
Many elements cycle through ecosystems,
organisms, air, water, and soil. Many of these are trace elements. Other elements, including carbon, nitrogen, oxygen, hydrogen, sulfur, and phosphorus are critical components of all biological life.
Because these elements are key components of life, they must be available for biological processes. The biogeochemical cycles transport and store these important elements so that they can be used by living organisms.
hope this helps!
