According to stratigraphy and its laws, what is the correct order – from oldest to youngest – of the following rock strata:

b, c, a, d
d, c, b, a
b, c, d, a
a, b, c, d

option (4)

Explanation:

According to the stratigraphic law of superposition, the layers of rocks that are at the base are the oldest rocks and those that are at the top are considered to be the youngest rock. This law enables the geologists to determine the age of the rock beds.

Considering the rock layer that is deposited at the bottom be A, followed by the next rock sequences B, C and D respectively, it can be concluded that rock layer A that is present at the bottom is the oldest rock and the rock layer D that is at the apex is the youngest rock.

Thus, the correct order from oldest to the youngest rock is A, B, C and D.

Hence, the correct answer is option (4).

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.

picture a world where computers are building made-to-order personalized robotic arms and synthetic organs, drones are circulating above mars! due to the rapid growth of technology, the future has never been more unpredictable, and it presents a huge challenge in education: we are teaching students how to work in a future that we have never been unsure of. it is widely predicted that in eight years’ time, there will be more jobs in the fields of science, mathematics, technology and engineering than in any other discipline. and, as the technology continues to develop, it will soon become clear that addressing social problems will involve more innovative thinking, and analytical and technical knowledge than ever before. undeniably, there are no subjects that encourage innovative and creative thinking, deep thought, problem solving and independence more than the stem subjects. while it is widely commented on that there is a need to reimagine the ways stem subjects are taught in schools by embracing a more interactive and innovative approach to appeal to more students, it should come as no surprise that some of the most reputable educational organizations in the world are already implementing changes to embrace stem. harvard, for example, announced in 2014 that they were increasing their computer science faculty by over 50% and has since introduced computer science as a core subject for all freshmen. the urgency of supporting stem subjects at a young age is becoming more relevant than ever, as adopting a keen interest in the curricula needs to happen early. however, beyond the age issue is one of gender.

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