Answer:
Because some organs rely on other organs to operate.
Explanation:
For an example, your entire body relies on your brain to give it orders. Your brain controls every part of your body, and without your brain you would most likely not be alive.
Another example would be your digestive systems. Your intestines rely on your stomach to break down your food (what's passed down to the intestines are referred t as waste).
Answer:
A, C, D and E are correct.
Whales did evolve from hoofed land-dwelling mammal ancestor, Pakicetus.
The nostrils moved from the front to the top of head to help them breathe while most of their body is submerged in water. As whales became aquatic, they used their tail more and more and the hind limbs became useless and vestigial. The skull became elongated over time because this design helped them be more aerodynamic in water and helped them evolve echolocation.
Explanation:
B. is incorrect because whales are mammals too.
F. is incorrect because their bones became more dense to help them stay submerged.
Polyploidy (more than two complete sets of chromosomes) is not rare among plants. For example, pollen grains may reach female flowers via animals or wind. In some cases, pollen grains from species with 4 complete sets of chromosomes will have 2 sets of chromosomes. Pollen grains may fuse with a female reproductive organ with 1 set of chromosome (so, female plant must have 2 sets of chromosomes). The resulting zygote will have 2 + 1 sets of chromosomes, so the plant will have 3 complete sets of chromosomes.
Answer:
To make our mRNA
Explanation:
I think it is this one, but I am not sure, sorry if it is wrong. :(
But I do know this, I think it might help you:
A transfer RNA (tRNA) is a special kind of RNA molecule. Its job is to match an mRNA codon with the amino acid it codes for. You can think of it as a kind of molecular "bridge" between the two. Each tRNA contains a set of three nucleotides called an anticodon.
