The functions of certain cells or organs are regulated by hormones, which circulate in the circulation.
Some basic characteristics of a hormone are:
- They are substances generated chemically by certain endocrine gland cells.
- Circulation carries them to the desired cells, tissue, or organ.
- They act according to their kind.
- They are present in incredibly small numbers. Most of them are soluble in water.
- They have a light molecular structure.
- After acting, they are destroyed.
- They are heterogeneous substances in terms of composition.
- They can't be kept for a very long period; typically, they are synthesized and secured as needed.
- Typically, they create hormone receptor complexes in target cells to activate them.
Learn more about the characteristics of hormones here:
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Answer:
a. Tetrapods were no longer tied to the water for reproduction
Explanation:
The amniotic egg is hard-shelled and is called an amniotic egg because the embro develops within a sac called amnion.
Amphibians were first tetrapods to invade the land. The need to return to water for reproduction limited their distribution. Amniotes evolved an egg that broke the tie to freshwater.
Amniotic egg contains a series of extraembryonic membranes (Amnion, allantois, chorion, yolk sac) that, among their features , takes the aquatic environment with the egg.
Hence a. Tetrapods were no longer tied to the water for reproductionis believed to be the most significant result of the evolution of the amniotic egg.
There are 12 chromosomes contain at the end of meiosis II. The events of meiosis II are most similar to
mitosis, Meiosis replaces gametes for sexual reproduction. Meiosis sexual t is
a Type of reproduction. Meiosis is a Replication
of DNA.
Fertile land is lost, and there is increased pollution and sedimentation in rivers and other aquatic areas.
1/10 because there is a less probability of u finding out the combination without the code.