<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:
Mass extinction is when biodiversity or species in a living habitat decreases to about three-fourths of its original number or to none. Such an event is identified by a sharp change in the diversity and abundance of multicellular organisms. It occurs when the rate of extinction increases with respect to the rate of speciation. Mass extinctions are usually associated with organisms that are macroscopic rather than microscopic. Examples of mass extinctions are Permian extinction of marine species, and Cretaceous extinction of various species, including dinosaurs.
Answer:
The Hypothalamus
Explanation:
This is a tiny part of the brain located at the forebrain, right above the pituitary glands. This tiny body regulates temperature control, thirst and sleep. It collects data from other parts of the brain and sense organs through nerve impulses. It acts as the link between the nervous system and the endocrine system.
The hypothalamus monitors the temperature of the blood that passes through it to detect any change in the body temperature. It also receives information about temperature changes in the external surroundings from thermoreceptors messages sent from the skin.
I only know the first one .Your teeth helps chew things to make it easier to digest in your stomach , which goes through your throat to your stomach. Your mouth uses muscles for the motion and movement for your teeth to chew.
Sex cells have half a set of chromosomes wheras body cells have a full set