D. brass and b. heterogeneous mix<span>ture</span>
Answer:
The answer is statement 3: Smaller class size is related to better academic performance
Explanation:
An hypothesis is an assumption taken to be true for the purpose of investigation.
Unlike statement 3, the statements 1, 2 and 4 are more like facts, since they are definite.
Thus, statement 3 tells of an assumption, and is an hypothesis
Answer:
The blood circulatory system delivers nutrients and oxygen.
Explanation:
The correct sentences are the following:
A) Antibiotic resistance in bacterial populations is caused by natural selection of bacteria that inherit mutations that make them resistant to the antibiotics.
C) Crossing-over causes a shuffling of allele combinations during meiosis as the alleles from each parent form new combinations on homologous chromosomes.
E) When two bacteria are linked during conjugation, the donor cell passes DNA to the recipient cell which causes genetic recombination.
Explanation:
These three options are associated with the generation and preservation of genetic diversity
The human body is thought to contain 40 trillion bacteria