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nata0808 [166]
3 years ago
7

Q.18. During which period did the first trilobites appear?

Biology
2 answers:
nirvana33 [79]3 years ago
8 0

Answer:

A. Cambrian period

Hope this helps :)

frez [133]3 years ago
7 0

Answer:

a) cambrian

Explanation:

The first body fossils of trilobites appeared in the Early Cambrian Period, about 540 million years ago.

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The maximum mass of a white dwarf is _________.
sveticcg [70]
1.44 solar masses :) you are welcome
3 0
3 years ago
Although it can progress unnoticed for many years, hypertension wreaks havoc on the human body, so adults should have their bloo
ioda

Hypertension or simply termed as high blood pressure is a condition In the cardiac system where the blood pressure and transfer from one part of the body to another exceeds the normal levels of the body. The heart is strongly pumping blood throughout the body which is caused by either lipid deposits in the vessels or in the heart itself.

Hence hypertension contributes to the conditions that already exists such as stress, or existing disorders and worsen it.  

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8 0
3 years ago
LaKeisha stepped on a piece of glass and quickly pulled her foot away from that sharp object. Which of the following are respons
nikdorinn [45]

Answer:

Motor nerves

Explanation:

Pulling the leg quickly from the sharp object is an example of reflex action. It includes sensory receptors, sensory neurons, interneurons, the control center (spinal cord), motor neurons and effector.

As soon as she steps on the glass piece, the receptors present in the skin of her foot sole sense it and send the information to the control center via sensory neurons. The spinal cord commands the muscles of the effector organ (leg) via motor neurons to move to step away from the glass piece.

5 0
3 years ago
What is the wavelength of a wave that has a velocity of 260 meters per second and a frequency of 95 hertz?
Leno4ka [110]
Velocity = frequency x wavelength
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= 260 / 95
= 2.736 m
= 3 m
7 0
3 years ago
How does the cardiovascular system help the body maintain homeostasis?
shtirl [24]

The right answer is C. thermoregulation and hormone transport.

The cardiovascular system has the function of distributing the blood to the organs.

Blood is a red and slightly viscous liquid that circulates in the blood vessels, propelled by the heart, is essential to the maintenance of life. It transports nutrients, oxygen and hormones to the cells of the body, and rids them of their waste.

Blood circulation helps control body temperature and regulates the volume of certain liquids in the tissues. In addition, the blood carries white blood cells, which defend our body against germs.

3 0
3 years ago
Read 2 more answers
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