I believe the answer is PREZYGOTIC isolating mechanisms
The analysis ToolPak is an add-in for Microsoft Excel program. The analysis ToolPak contains data analysis tools that can be used for financial, engineering and statistical data evaluation. The analysis Toolpak can be activated through the following sequence of steps;
File-->Options-->Add-ins -->Manage Excel Add-Ins --> Go.
<span>starfish
</span> All normal eggs from the mother have an X chromosome while usually half the sperm cells from the father have a Y (male) chromosome and the other half have an X (female) chromosome and it is therefore the father's sperm that dictates which gender the embryo will take.
If the egg is fertilized by a sperm with a Y chromosome then the embryo will be a genetic male due to XY chromosome combination.
<span>If the egg is fertilized by a sperm with an X chromosome then of course the embryo will be a genetic female due to XX chromosome combination.</span>
Answer:
C)All of the choices are correct.
Explanation:
The major blood types include; A, B,AB and O. Type A has A antigens, B has B antigens AB has both A and B antigens and O has neither.
A person's immune system produces antibodies against any antigens not found in his blood.
Before giving a blood transfusion, it is necessary to determine the blood type of the recipient and that of the donor so that blood can be appropriately matched. This is called blood typing. This helps prevent ABO incompatibility which might lead to several fatal symptoms and reactions. These include;
Fever and chills
Abdominal, back and chest pains
Jaundice
Nausea
Muscle pains
Systemic shock and organ failure.
Answer and Explanation:
This is a model of an atom. Atoms are made up of three main parts: neutrons, protons, and electrons.
Neutrons are neutrally-charged subatomic particles, protons are positively-charged subatomic particles, and electrons are negatively-charged. Neutrons and protons are always located in the nucleus of the atom, which is basically the central location. Electrons, on the other hand, orbit all around this nucleus.
In the model, the protons and neutrons should be labelled in the center big golden ball, while the electron should be labelled on the small spheres "orbiting" this big center one. The electrons should also be labelled "negatively charged". Finally, the nucleus is positively charged because it's made up of protons (which are positive) and neutrons (which have no charge).
