Answer:
<u>D. There is less available energy in the fourth trophic level because of the loss of energy through metabolism in each of the lower trophic levels.</u>
Explanation:
Each successive trophic level contains about ten percent of the available energy from the previous trophic level. The other ninety percent is lost as heat to the atmosphere through metabolism by the organisms in that level. Therefore, there will be much less energy in the fourth trophic level.
Comparative embryology is the branch of embryology that compares and contrasts embryos of different species. It is used to show how all animals are related.
Answer:
D. Agronomist
Explanation:
Agronomists are professionals that study how to make soils more productive (in terms of food) around the world. Soil pH is an index that calculates the acidity/alkalinity of the soil, which is indicated on a 14-point scale (pH equal to 7 = neutral; pH below 7 = acidic, pH higher than 7 = alkaline). In this regard, it is well known that the pH of the soils drastically affects plant development, and thereby a proper soil pH is fundamental to ensure optimal plant growth (required for nutrient intake). For this purpose, agronomists are in charge of studying and researching the pH of the soils in order to increase crop yields. Nowadays, the pH of the soils can be easily measured by digital soil pH pocket testers that utilize a pH electrode in order to calculate the pH value.
Crossing over of Homologous chromosomes during meiosis.
Sunlight is the main change! sun light cannot penetrate into the deep layers of the ocean and availability of oxygen is also low there. this causes the considerable amount of organisms to live in the upper layers of the ocean and we can only observe decomposing organisms in the deeper layers!
