Answer:
The history of Earth covers approximately 4 billion years (4,567,000,000 years), from Earth's formation out of the solar nebula to the present. Earth formed as part of the birth of the solar system: what eventually became the solar system initially existed as a large, rotating cloud of dust and gas.
Explanation:
<span>a. lawn fertilizer runoff
Pollution as a result of lawn fertilizer runoff would be difficult to track and regulate due to the possible breadth of the area affected. Toxins can be spread throughout the land area as well as be carried downstream if near a water source. Sewer systems, rivers, lakes, ponds, etc. can all be negatively affected by lawn fertilizer runoff. Irrigation or rain water can carry toxins for many miles before the effects are detected. Tracing the source of the toxins would be difficult, especially in a highly populated area.</span>
Answer:
A) tortoiseshell female; black male
Explanation:
Females have two X chromosomes and males have an X and a Y chromosome.
<u>The possible genotypes and phenotypes are</u>:
- XᵒXᵒ: black female
- XᵒY: black male
- XᴼXᴼ: orange female
- XᴼY: orange male
- XᵒXᴼ: tortoiseshell female
<u>Cross of a black female and an orange male</u>
<h3>XᵒXᵒ x XᴼY</h3>
The female only produces Xᵒ gametes. The male produces Xᴼ and Y.
The possible offspring therefore is: XᵒXᴼ (tortoiseshell females) and XᵒY (black males). The answer is A.
Answer:
A. a dependent variable.
Explanation:
A scientific experiment contains three types of variables (factor or condition) in experiments: the dependent, independent and controlled variables.
The independent variable is the variables which can be changed or altered naturally or artificially like the sunlight, temperature whereas a dependent variable is a variable which depends on the independent variable and is the studied parameter of the experiment.
In the given question, since the production and the number of the seeds is influenced by the pollinator, therefore, a number of seeds will be considered the dependent variable.
Thus, Option-A is the correct answer.
The answer is (B) drought.
A drought is a deficiency in precipitation that occurs over an extended period. Droughts, while experienced in most climates from time to time, cause extensive damage when an area experiences repeated and long standing periods of drought. The lack of precipitation affects animal life and plant life, including human food resources. The results can be devastating and it is because of these reasons that droughts are thought to be the most damaging of weather patterns.