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3 years ago

Why is a bush or tree a more accurate then a line to describe how hominds developed into modern humans

1 answer:

6 0

The human “family tree” may be better described as a “family bush,” within which it is impossible to connect a full chronological series of species, leading to Homo sapiens, that experts can agree upon.

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Which equation shows how wavelength is related to velocity and frequency?

Nataly_w [17]

Answer:

The correct option is the option;

$\lambda = \dfrac{v}{f}$

Explanation:

The wavelength of a wave is the distance between two successive crests of the wave

Therefore, the wavelength, λ, is given by the fraction of the velocity, v, of the wave divided by the frequency, f, (the number of cycles that pass through a point) of the wave

Mathematically, we have;

$The \ wavelength, \ \lambda = \dfrac{The \ wave \ velocity, \ v}{The \ wave \ frequency, \ f}$

$\lambda = \dfrac{v}{f}$

4 0

3 years ago

Seawater, which covers the majority of the earth, is composed primarily of molecules of H2O and equal numbers of Na ions and Cl-

Vsevolod [243]

Explanation:

Species present are $H_{2}O(l)$ , $Na^{+}(aq)$ and $Cl^{-}(aq)$ . Now, we will calculate the number of componenets present as follows.

C = n - E

where, E = number of independent equations

n = number of phases present

Therefore, we will calculate the number of components as follows.

C = 3 - 1

= 2

Since, sodium chloride (NaCl) will tend to form a homogeneous mixture in water. Therefore, phase will be equal to 1.

Therefore, it means that there are two components present in one phase.

5 0

3 years ago

Tool that can be used to find direction of magnetic field

olga55 [171]

A simple magnetic compass can be used

6 0

4 years ago

Preparation of ethanoic acid from 1,1,1-trichloroethane

alekssr [168]

Anaerobic transformations of 1,1,1-trichloroethane (TCA), 1,1-dichloroethane (DCA), and chloroethane (CA) were studied with sludge from a lab-scale, municipal wastewater sludge digester. TCA was biologically transformed to DCA and CA and further to ethane by reductive dechlorination. TCA was also converted to acetic acid and 1,1-dichloroethene (11DCE) by cell-free extract. 11DCE was further biologically converted to ethene. This pathway was confirmed by transformation tests of TCA, DCA and CA, by tests with cell-free extract, and by chloride release during TCA degradation.

4 0

3 years ago

EASY Chemical reactions Balance and classify

Marat540 [252]

Answer:

double replacement

synthesis

double replacement

i think this one is decomposition

synthesis

double replacement

single replacement

double replacement

single replacement .....

hopefully i help

6 0

3 years ago