Question

Q1. Read the following passage and answer the questions correctly.
Animals are great builders, using simple materials but employing sound
engineering principles. Man has long used suspension bridges made of
ropes of steel and concrete which bear loads in tension. The webs of
spiders provide the most vivid example of animal structure built entirely
in tension. The Spider web silk is so strong that many species of birds
use to build their nests. It has a stiffness index of which is 30 times less
than that of steel, yet has a tensile strength one and a half times as
much as that of steel. Unlike steel, silk stretches to more than twice its
original length, before breaking. These qualities, it is now known, are
owing to silk being a protein polymer composed of crystalline regions
composed of interspersed with regions of randomly arranged chains
Beavers are natural engineers. They use tree branches to construct
dams, the divided end being pressed into the walls: this apparently
serves to collect stress from a broad area and to focus it into a single
trunk embedded into the substrate of the stream. The dams of the
beaver have an angle of forty-five degree on the downstream side. This
enables the structure to bear not only its own weight acting downward,
but also to resist the lateral pressure of water acting on the upstream
side.
Constructing a very thick wall is uneconomical. Strength could also be
provided to a wall by buttresses or by making the base wide. The nest of
a termite Amitemesmeridionalis is more than two meters high with a
wide base which tapers at the top. This ensures great resistance to
sheer forces
On the basis of your understanding of the passage, answer any ten questions from
the twelve that follow
(1x10-10)
(1) The three engineers of nature being discussed here are -
a) Spiders
b) Beavers
c) Termites
d) All of the above​

Answer 1

D.all of the above
Hope it helps

Answer 2

Explanation:

I think d) all of the above is the correct answer.