Vestigial structures are inherited from ancestors, but have lost much or all of their original function due to different selection pressures acting on the descendant. The hipbones of bottlenose dolphins are vestigial structures. However, as the dolphin lineage adapted to life at sea, this function was lost.
Answer:
39 double-helical DNA molecules will be presenet in sperm and 39 in egg.
Explanation:
Each chromosome is made up of histone protein and a molecule of DNA.
Each cell contain double number of chromosomes (2n) except a few exceptions like sperm (1n) and egg (1n).
Human body cells contain 46 chromosomes while sex cells contain 23 chromosomes because of meiosis. Similarly dog cells contain 78 chromosomes while their gametes i.e egg and sperm each contain 39 chromosomes. The fertilization of sperm and egg will restore the chromosome numbers.
<em>As there is only one double helix DNA present in chromosome, so there would by 39 double helix DNA in sperm and 39 double helix DNA in egg. </em>
Answer: Greenhouse gases arise naturally, and are part of the make-up of our atmosphere. Earth is sometimes called the “Goldilocks” planet – it’s not too hot, not too cold, and the conditions are just right to allow life, including us, to flourish. Part of what makes Earth so amenable is the naturally-arising greenhouse effect, which keeps the planet at a friendly 15 °C (59 °F) on average. But in the last century or so, humans have been interfering with the energy balance of the planet, mainly through the burning of fossil fuels that give off additional carbon dioxide into the air. The level of carbon dioxide in Earth’s atmosphere has been rising consistently for decades and traps extra heat near the surface of the Earth, causing temperatures to rise.
Explanation:
Answer:
It means you can feel the heat from the other person's hand.
Explanation:
