Down Syndrome is caused by trisomy 21.

True or false

Develop when two eggs each get fertilized by two different sperm, resulting in two zygotes in the uterus at the same time.

7) Suppose that there is a town called Cellville. What cell organelle would have a similar purpose to the roads throughout the town? a. ribosomes b. Golgi body c. chloroplasts d. endoplasmic reticulum

In plants what is the vesicle that stores water and liquids called

Saheem is at a party and is starting to bump into people. his movements are uncoordinated and his vision is blurry. what do you think his blood alcohol level is

What are the two primary sources of energy for the earth

Rhizobia are bacteria that live on the roots of some plants, such as legumes like pea plants. Rhizobia convert an element in the atmosphere into ammonia. Identify and explain the type of relationship this represents.

A scientist is carrying out replication of DNA artificially in her laboratory. What will she use to join the gaps on the DNA strand? (a.) the enzyme DNA polymerase (b.) the enzyme DNA ligase (b.) an artificial adhesive compound

Which part of an atom has most of its mass

One of the challenges of wind power is that the ___ of wind ___ day to day depending on weather conditions

How does the human brain interpret and render the surroundings and state of the body?