how do organisms with many cell types develop from a single cell
Answer:
A multicellular organism develops from a single cell (the zygote) into a collection of many different cell types, organized into tissues and organs.During development, cells use both intrinsic, or inherited, information and extrinsic signals from neighbors to "decide on" their behavior and identity.
Answer:
Natural selection
Explanation:
Natural selection favors the individuals carrying the adaptive variations and allows them to reproduce more as their beneficial variations impart them the survival advantage. These individuals with beneficial adaptive traits reproduce more and produce a large number of progeny, all carrying the useful adaptive features of the parents.
Hence, natural selection favors individuals with beneficial variations. The differential rate of reproduction of the favored individuals allows inheritance of favored variations to the future generations.
2)Which best describes the aquifers?
Aquifers 1 and 3 may result in a reduced river flow.
Aquifer 2 may result in reduced surface water levels.
Aquifers 2 and 3 may result in decreased wetland and spring discharge.
Aquifer 3 may result in an increase in productivity.
3)How can recycling materials lead to environmental sustainability?
a.
Recycling materials helps decrease the amount of new materials taken from the environment.
b.
Recycling materials helps increase the rate of carbon sequestration.
c.
By recycling materials, the amount of biomass available for energy purposes is increased.
d.
All of the above
1. The correct answer is B. Conservation tillage practices help the soil erosion and also maintains soil nutrient levels.
Conservation tillage is termed as the tillage system which helps to conserve energy, soil, water through retention of crop residue and reduction of tillage intensity.
2. Correct answer is A. Aquifers 1 and 3 may result in a reduced river flow. Aquifer is termed as the underground layer of rock fractures, water-bearing permeable rock.
Hydrogeology is termed as study of water flow which is found in aquifers.
3. Correct answer is A. Recycling materials helps decrease the amount of new material which are taken from environment.
Most household can be recycled. Some other examples which are recycled include textiles, plastics, organics, and metals. Metals such as drinking bottles and food cans which are made from steel and aluminium can be recycled.