What are the two classes of pure substances?

Biology

2 answers:

Viefleur [7K]3 years ago

8 0

Elements and compounds

Alenkinab [10]3 years ago

5 0

Answer:

Elements and compounds

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Will mark brainliest! write in your own words please!

otez555 [7]

Answer:

What makes us human the most is our self-awareness and the ability of philosophical thought.

We understand we exist on Earth and wonder why the sky is blue, which is a trait no other species possesses.

Explanation:

Orangutans, chimpanzees, gorillas, bottlenose dolphins, elephants, orcas and bonobos all have self-awareness. But still don't wonder why the sky is blue.

Animals were seen capable of doing all the other factors.

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Henry was studying two populations of the same species of lizards. One population lived on an island and the other lived on the

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The answer is B. Genetic drift greatly affects small populations, but large populations can recover.

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your frien d runs out of gas and you have to help push his car. discuss the sequence of b ones and joints that convey the forces

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<h2>Upper limb,Pectorial girdle and Axial skeleton</h2>

Explanation:

Upper limb-

The muscles of the upper appendage can be divided into 6 distinct areas such as pectoral, shoulder, upper arm, front lower arm, back lower arm, and the hand
There are 4 muscles of the pectoral locale pectoralis major, pectoralis minor, serratus foremost and subclavius

Pectorial girdle-

The shoulder girdle or pectoral girdle is the arrangement of bones in the attached skeleton which interfaces with the arm on each side
In many of the it comprises of the scapula and clavicle
In many species have three bone found in the shoulder, it connected of the coracoid and clavicle and scapula

Axial skeleton function-

The pivotal skeleton underpins and ensures the mind, spinal rope and huge numbers of the interior organs
It likewise gives locales to the connection of different bones and muscles in the body and shields the nerves and veins from the cerebrum and spinal line.

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They both have cell wall

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Which cells are required to process and present antigens from foreign material as the initial step in the immune response?

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The macrophage is the cell responsible for detecting, engulfing and destroying pathogens and apoptotic cells. These cells process and present antigens (foreign materials) to immunocompetent cells and thus they are the key mediators in the development of all immune reactions.

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4 years ago