The organisms living on the bottom of the ocean are collectively referred to as

Benthos

The organisms living at the bottom of the ocean are collectively referred to as benthos. The benthos are found in the lowest layer of a sea or river known as benthic zone. Benthos can be classified into three groups based on their habitat. The groups are hyperbenthos (organisms that live near the bottom. An example is rock cods), epibenthos (organisms that are attached to the floor or rocks. An example is sponges) and endobenthos (organisms that live within the sediments. An example is sand dollar).

mendel's first law states that during the formation of reproductive cells , pairs of hereditary factors for a specific trait separate so that offspring receive one factor from each parent.

explanation:

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]