The way that humans impact rivers and streams is pollution.
Pollution is the release of toxic or harmful substances into the environment such as water, air and the atmosphere.
Pollution as an act can be conducted by humans or anthropogenic activities. The ways by which humans release harmful wastes into rivers and streams is;
Therefore, the way that humans impact rivers and streams is pollution.
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Answer:
ITS (D) All of the above.
Explanation:
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Answer:
Plant Cell
contains both
mitochondria
vacuole
nucleus
Answer: The correct answer is -
interphase and M phase.
Explanation:
Cell cycle can be described as a series of events that take place for the division of cell into two daughter cells.
It is primarily divided into two stages, which are-
1) Interphase (that is further divided into G1, S, and G2 phase) that involves the duplication of DNA and other proteins required in cell division.
2) M (mitotic phase) phase during which the nuclear division takes place through four successive stages that are prophase, followed by metaphase, anaphase and telophase.
After this cytokinesis (cytoplasmic division) occurs resulting in formation of two daughter cells.
Thus, first option is the right answer.
tricuspid valve
mitral valve
The mitral valve prevents a backflow of blood into the left atrium. It closes when the heart contracts, preventing blood from flowing back. Other valves like the aortic and tricuspid have different functions.
The mitral valve, also known as the bicuspid valve, is the valve that prevents a backflow of blood into the left atrium. This valve is located between the left atrium and the left ventricle. When the heart contracts, the mitral valve closes, preventing blood from flowing back into the atrium. The other valves listed, the aortic valve and the tricuspid valve, have different functions. The aortic valve controls blood flow from the left ventricle into the aorta, and the tricuspid valve prevents backflow of blood into the right atrium.
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Answer:
Because of insufficient number of offsprings to determine the result of test cross.
Explanation:
Normally, in genetics, a test cross is a cross between a dominant phenotype (genotype unknown) and a homozygous recessive genotype in order to determine the genotype of that dominant organism.
The result of the test cross is obtained when a 1:1 phenotypic ratio is produced for each trait i.e. 1 dominant trait: 1 recessive trait showing that the parent is heterozygous while all the offsprings will show dominant traits if the dominant phenotype was homozygous. Hence, more than one offspring is required to be able to conclude
In this question, the cow only produce one offspring which may be DOMINANT for the observed trait making it difficult to know if other offsprings will all be dominant or some of them recessive. Hence, it is not a sufficient number needed to determine the genotype from the phenotypic ratio of offsprings.