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Deffense [45]
3 years ago
11

Cnidaria and flatworms exchange gases and remove wastes by way of their:

Biology
1 answer:
photoshop1234 [79]3 years ago
4 0
The answer is D, moist skin surfaces.

Explanation:
Cnidaria and flatworms respirate and extreme through their skin via diffusion.
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"46. The largest number of neurons within the brain and spinal cord are _____; they are responsible for the central nervous syst
Whitepunk [10]

Answer:

INTERNEUTRONS

Explanation:

INTERNEUTRONS

Interneutrons are really the highest number of neurons and spinal cord. They are accountable for the diverse communication system of the nervous system and try and resolve between inputs and outputs.

Interneurons are groups of nerve cells commonly found in nervous system integrative areas where axons & dendrites are restricted to a specific area of  brain.

3 0
3 years ago
How did humanity start?
svetoff [14.1K]




Human evolution

Human evolution is the lengthy process of change by which people originated from apelike ancestors. Scientific evidence shows that the physical and behavioral traits shared by all people originated from apelike ancestors and evolved over a period of approximately six million years.
One of the earliest defining human traits, bipedalism -- the ability to walk on two legs -- evolved over 4 million years ago. Other important human characteristics -- such as a large and complex brain, the ability to make and use tools, and the capacity for language -- developed more recently. Many advanced traits -- including complex symbolic expression, art, and elaborate cultural diversity -- emerged mainly during the past 100,000 years.
Humans are primates. Physical and genetic similarities show that the modern human species, Homo sapiens, has a very close relationship to another group of primate species, the apes. Humans and the great apes (large apes) of Africa -- chimpanzees (including bonobos, or so-called “pygmy chimpanzees”) and gorillas -- share a common ancestor that lived between 8 and 6 million years ago. Humans first evolved in Africa, and much of human evolution occurred on that continent. The fossils of early humans who lived between 6 and 2 million years ago come entirely from Africa.
Most scientists currently recognize some 15 to 20 different species of early humans. Scientists do not all agree, however, about how these species are related or which ones simply died out. Many early human species -- certainly the majority of them – left no living descendants. Scientists also debate over how to identify and classify particular species of early humans, and about what factors influenced the evolution and extinction of each species.
Early humans first migrated out of Africa into Asia probably between 2 million and 1.8 million years ago. They entered Europe somewhat later, between 1.5 million and 1 million years. Species of modern humans populated many parts of the world much later. For instance, people first came to Australia probably within the past 60,000 years and to the Americas within the past 30,000 years or so. The beginnings of agriculture and the rise of the first civilizations occurred within the past 12,000 years.
Hope this helps:)

3 0
2 years ago
Read 2 more answers
What process takes oxygen into cells
lbvjy [14]

Answer:

Cellular Respiration

Explanation:

In cellular respiration, animals take in O2 (oxygen) and exhale CO2 (carbon dioxide).

5 0
3 years ago
How did early cells get their food
Misha Larkins [42]

Answer:

Through photosynthesis, organisms could use sunlight to make food from carbon dioxide and water.

They provided food for themselves

Explanation:

3 0
3 years ago
Carbohydrate loading maximizes the amount of which substance stored in skeletal muscles?
Romashka [77]

Answer:

The correct answer is d. glycogen

Explanation:

Carbohydrate loading is a very common practice in athletes. It consists of eating carbohydrate-rich food specially before doing exercise. This practice maximizes the stored quantities of glycogen- polysacharide of storing of glucose- in muscle and liver.

3 0
3 years ago
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