True. Because the chemical messages are called hormones.
Answer: Van der Waals forces
Explanation:
Van der Waals forces are weak intermolecular forces that depend on the distance between two particles. They are caused by correlations in the change in polarization between two nearby particles. To put it in other words, when a particle changes its polarization (becomes more positive on one end and more negative on the other), so does the adjacent particle, and the next one, and so on. This causes these particles to stick together weakly.
The tiny "hairs" increase the surface area of the gecko's feet in contact with the wall, which makes the bond stronger and allows it to support all of its weight.
Because experiments have shown that geckos stick well to both hydrophobic and hydrophilic surfaces, we can assume there aren't any hydrogen bonds present.
Ionic bonds can't be present either because geckos wouldn't stick to electrically neutral surfaces, as these bonds require charged molecules.
Estrogen and testosterone are non polar in nature.They can easily pass the cell mambrane which is made up of lipid bilayer.After entering the cell they bind to their intracellular receptors present in the cytoplasm.
The receptor hormone complex moves to the nucleus and perform transcription and later on translation of desired proteins.
Estrogen helps in the functioning of reproductive system as it supports growth and differentiation.Whereas testosterone is important for sertoli cells which help in the process of spermatogenesis i.e formation of sperm.
The correct answer to your question is<span> The common nucleic acid sequences of polar bears and black bears can be deduced from their classification in the same genus, Ursus. In this sentence, it will explain that there is a hierarchy among organism and by the word "genus", this means this is one of the part of the hierarchy.</span>
