The initial stages of human embryogenesis.
8-cell embryo, at 3 days.
Blastocyst with an inner cell mass and trophoblast.
Trophoblast differentiation.
Histogenesis of the three germ layers.
Artificially colored - gestational sac, yolk sac and embryo (measuring 3 mm at 5 weeks)
Embryo attached to placenta in amniotic cavity.
The abiotic factors that could cause the sea cucumbers to
differ their distance from one another are temperature, time of the day, and
humidity. The biotic factors that could influence are the organisms around
these creatures. Furthermore, the independent variable in this study is the
time of the day where observed are the average distance between these sea
creatures and their output, the distribution of sea cucumbers as the dependent
variable.
Hypothesis: There is a link between the time of the day and the distance of sea cucumbers amongst each other.
---------------------------------------------------
Answer:
<u><em>C. bacteria genetically modified to be antibiotic-resistant</em></u>
Explanation:
<em>Genetically modifying organisms can be either beneficial or harmful for humans. As we can be infected by bacteria, we developed antibiotics to fight those infections, and this saves many lives as it is an efficient medicine.</em><em> But when a bacteria is genetically modified to be resistant to antibiotics, we can be harmed as we don't have a way to fight the infection and the bacteria will spread (even maybe kill us).</em><em> T</em><em>herefore, bacteria that are antibiotic-resistant do not benefit humans, and the correct answer is C. bacteria is genetically modified to be antibiotic resistant.</em>
Answer:
Air sacs do not take part in the actual oxygen exchange, but do greatly enhance its efficiency and allow for the high metabolic rates found in birds. This system also keeps the volume of air in the lung nearly constant.
Explanation:
- Air sacs are found as tiny sacs off the larger breathing tubes (tracheae) of insects, as extensions of the lungs in birds, and as end organs in the lungs of certain other vertebrates. They serve to increase respiratory efficiency by providing a large surface area for gas exchange. See also pulmonary alveolus.
<h2>
</h2>
Answer:
C and D
C - UV radiation maycause negative regulators (tumor suppressors) to be under-expressed.
D - UV radiation may cause positive regulators (oncogenic) to be over-expressed.
