Question

Please Answer my question speedly my test is going on
give the answer in True and False ​

Answer 1

Answer:

i) False

ii) True

iii) True

iv) True

v) False

Explanation:

i) The top layer of the soil is called topsoil. This layer is a mixture of sand, silt, clay and broken down organic matter, called humus.

Layer just below the topsoil is the subsoil. It may contain some broken down organic matter but it is mostly made of weathered rocks and clay minerals.

ii) Sponges, corals, worms, insects, spiders and crabs are all sub-groups of the invertebrate group - they do not have a backbone.

iii) The ribs are connected to the sternum with a strong, somewhat flexible material called cartilage. It helps to protect the organs in the chest, such as the heart and lungs, from damage.

iv) The human skull is generally considered to consist of twenty-two bones—eight cranial bones and fourteen facial skeleton bones. In the neurocranium these are the occipital bone, two temporal bones, two parietal bones, the sphenoid, ethmoid and frontal bones.

v) The adult human skeleton is made up of 206 bones. These include the bones of the skull, spine (vertebrae), ribs, arms and legs.