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maks197457 [2]
4 years ago
11

Trace fossils are recognized as evidence of which pre-existing life? plants plants and animals neither plants nor animals animal

s
Physics
2 answers:
photoshop1234 [79]4 years ago
5 0

Answer:

a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.

Explanation:

Trace fossils are the indirect evidence of life in the past, such as the footprints, tracks, burrows, borings, and feces left behind by animals, rather than the preserved remains of the actual animal body itself.

Fossil is the naturally preserved remains of plants and animals which somehow get trapped in amber, hair, petrified wood, oil, coal, and DNA remnants.

Kazeer [188]4 years ago
5 0

The correct answer is B. Plants and animals

Explanation:

Trae fossils refer to traces, prints of impressions of an organism that lived in the past, this occurs in the case the organism accidentally left an impression on a material that later hardens and remains over time. This also implies trace fossils only show the shape of an organism or parts of it but does not contain material fo the organism itself. This type of fossil has been used by scientists as evidence of past and extinct life forms included both animals and plants as fossils of reptiles, insects, fish, mammals, among others have been found but also fossils of some plants such as ferns.

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The ball rolls horizontally thus it is not affected by the gravitational acceleration. We assume that velocity is constant since we are not given acceleration. Therefore, acceleration is zero. The speed of the ball after 2 seconds will still be the same given we have a constant velocity system. Option A is the answer.
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4 years ago
Read 2 more answers
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Zinaida [17]
B) initial speed (u)=3
final speed (v)=8
time (t)= 10
acceleration (a)=?

v=u+at
8=3+a(10)
5=10a
a=1/2= 0.5 m/s²

c)displacement (s)=?
1st section of journey

v ²=u ²+2as
8 ²=3 ²+2(0.5)s
64=9+1s
s=55meters

2nd section of journey
a=0
t=7
u=8
s=?

s=ut+1/2at²
s=8(7)+1/2(0)(7 ²)
s=56 meters

56+55= 111 meters

(For graph x axis =time (sec) & y axis= velocity (m/s))

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3 years ago
An aluminum wire having a cross-sectional area equal to 3.00 10-6 m2 carries a current of 7.00 A. The density of aluminum is 2.7
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Answer:

Vd = 2.42 ×10⁻⁴ m/s

Explanation:

Given: A = 3.00×10⁻⁶ m², I = 7.00 A, ρ = 2.70 g/cm³

To find Drift Velocity Vd=?

Sol

the formula is Vd = I/nqA             (n is the number of charge per unit volume)

n = No. of electron in a mole ( Avogadro's No.) / Volume

Volume = Molar mass / density   ( molar mass of Al =27 g)

V = 27 g / 2.70 g/cm³ = 10 cm³ = 1 × 10 ⁻⁵ m³

n= (6.02 × 10 ²³) / (1 × 10 ⁻⁵ m³)

n= 6.02 × 10 ²⁸

Now

Vd = (7A) / (  6.02 × 10 ²⁸ ×  1.6 × 10⁻¹⁹ C ×  3.00×10⁻⁶ m²)

Vd = 2.42 ×10⁻⁴ m/s

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3 years ago
Which describes the position on a horizontal number line
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Answer:

It is formed by a horizontal number line, called the x-axis, and a vertical number line, called the y-axis.

Explanation:

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