Ques: Q: What factors consist of parts of the environment that are or were alive, and their remains? Read this paragraph and choose the correct option from the provided answers: Biotic factors are the parts of the environment that are alive, or were alive and then died, such as plants, animals, and their remains. Biotic factors also include bacteria, fungi and protists. Choices: - abiotic factors - xerophytic factors - decomposition factors - biotic factors A:
Ans: biotic factors

Ques: Q: Ecosystem dynamics include more than the flow of energy and recycling of matter. ecosystems are also dynamic because they? Read this paragraph and choose the correct option from the provided answers: Ecosystem dynamics include more than the flow of energy and recycling of matter. Ecosystems are also dynamic because they change through time. Choices: - stay the same - recreate exactly alike - never move - change through time A:
Ans: change through time

Ques: Q: Aids is an infectious disease of which system? Read this paragraph and choose the correct option from the provided answers: AIDS is an infectious disease of the immune system caused by a virus. Some diseases of the immune system are noninfectious. They include autoimmune diseases and allergies. Choices: - muscular - digestion - endocrine - immune A:
Ans: immune

Ques: Q: Down syndrome is caused by having three copies of what, a condition known as trisomy? Read this paragraph and choose the correct option from the provided answers: Chromosomal Disorders Sometimes a genetic disease is not caused by a mutation in a gene, but by the presence of an incorrect number of chromosomes. For example, Down syndrome is caused by having three copies of chromosome 21. This is known as trisomy 21. The most common cause of trisomy 21 is chromosomal nondisjunction during meiosis. The frequency of nondisjunction events appears to increase with age, so the frequency of bearing a child with Down syndrome increases in women over 36. The age of the father matters less because nondisjunction is much less likely to occur in a sperm than in an egg. Whereas Down syndrome is caused by having three copies of a chromosome, Turner syndrome is caused by having just one copy of the X chromosome. This is known as monosomy. The affected child is always female. Women with Turner syndrome are sterile because their sexual organs do not mature. Choices: - genome - variation - DNA - chromosome A:
Ans:
chromosome