Following gastrulation, the next major development in the embryo is neurulation, which occurs during weeks three and four after fertilization. This is a process in which the embryo develops structures that will eventually become the nervous system
Answer:
the correct choice is B
located roughly between the orbits of the planets Mars and Jupiter. It is occupied by numerous irregularly shaped bodies called asteroids or minor planets.
B. Chloroplasts perform photosynthesis, which converts light into sugar, which is food (energy). Then, the organelle mitochondria coverts that energy into a more usable form of energy by the cell, in a process called cellular respiration.
The nitrogenous bases placed in between the DNA double helix strands, like rungs on a ladder, are positioned there because of the hydrophobic effect and are stabilized by hydrogen bonding. The stability of DNA also relies on the interactions between the hydrogen bonds between bases, hydrogen bonds between bases and surrounding water, and base interaction between neighboring bases.
Hydrogen bonds are able to stabilize the DNA double helix by pairing up with their complementary base pairs (guanine with cytosine and adenine with thymine)
Hope this was able to help you! I went through my answer and bolded the more important parts, and parts more useful for answering the question.
Missing options:
A) Nerodia spedon and Nerodia fasciata
B) Eudocimus albus and Ardea albus
C) Egretta thula and Platalea ajaja
D) Pituphis melanoleucus and Thamnophis proximus
Answer:
A) Nerodia spedon and Nerodia fasciata
Explanation:
Phylogenetically, the closer relatives share same ancestor and therefore same clad in phylogenetic tree. In the given options, Nerodia spedon and Nerodia fasciata share same genus name so they are closer relatives. If we go further about their characteristics, they are two types of water snakes that are found in north and south America. They both are also non-venomous.
On the other hand, remaining options are not correct because none of the mentioned organisms share same genus name and belong to different positions in the phylogenetic tree.
