Early cleavage divisions in most embryos are also rapid. One reason for this is that cleaving cells have a modified cell cycle, in which the two gap phases, G1 and G2 are completely omitted, and the cells cycle rapidly between M and S phases. In addition, because the major cytoskeletal systems of the cells are largely devoted to mitosis (microtubules) and cytokinesis (microfilaments) during rapid cleavage division, there is typically an antagonism between periods of rapid cell division and cell movement. Thus as the embryo approaches gastrulation, there is a tremendous slowing in the rate of division (note the slope of the curve at the right).
Answer:
C. Fossils of the winged dinosaur Archaeopteryx show that it had modified scales that produced feathers.
You would predict that indoleacetic acid, a plant hormone, would have is a Auxin.
A chemical known as indoleacetic acid (IAA) is produced by plants and a few microorganisms (3, 4). IAA is important for both root and shoot growth in plants. By means of an efflux pump (PIN1-7) and a specified importer (AUX1), the hormone travels from one area of the plant to another (5, 6).
Auxin mainly help in complex mechanism of a plant , which lead many metabolic activities in plant .
What is Auxin ?
- Auxin plays a crucial role in controlling plant growth and development by regulating embryonic development, root and stem tropisms, apical dominance, and the transition to blooming.
- It is used to start off shoot growth in culture and encourages lateral and accidental shoot growth.
- Aids in overcoming auxin-induced apical dominance.
- Encourage the development of leaves' chloroplasts.
- Encourages the mobilization of nutrients and delays leaf senescence.
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Answer:
The correct answer is VAGINA.
Explanation:
The urinary system refers to the collection of organs that work together to produce urine in human system. The organs that make up the urinary system include the following: kidneys, urinary bladder, ureter and urethra. The vagina is therefore not part of the urinary system. Apart from production of urine, the urinary system also regulate blood volume and blood pressure, it regulates pH and also control levels of electrolytes.
I’m guessing you’re asking what factors make up evolution, and my best answer to this would be natural selection leads to the making of evolution. Slowly over hundreds of years even thousands tiny differences are made in a species that helps it adapt to the environment it lives in. A good example is giraffes, as the trees gradually grew taller the ones with longer necks could still eat and survived. They bred their traits to the next generation. Those with shorter necks could not reach the trees, could not eat, and would die off.
