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4 years ago

7

Human embryos provide the most startling evidence. Under the microscope, tiny slits around the neck were clearly visible: exactl

y the same structures were found in fish. But in fish they turned into

1 answer:

Alona [7]4 years ago

8 0

Answer:

gills

Explanation:

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Why is the phloem in a leaf important to the roots of a plant?

suter [353]

Answer:

The correct answer is A it transport the food generated by photosynthesis.

Explanation:

Both xylem and phloem are the examples of vascular tissue present in plants.xylem helps in the transport of water from root to different parts of the plants.

Whereas phloem helps in the transport of photo synthate from mesophyll tissue to sieve element companion cell complex.The transport of photosynthate to different non photo sythetic parts of a plant involves both symplastic and appoplastic pathway.

Symplastic pathway is a passive process depending on the pressure gradient for the transport of solutes through the plasmodesmata which connect 2 adjacent plant cells.

Appoplastic pathway is an active transport process occuring against the concentration gradient which does not involve plasmodesmata.

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3 years ago

Surface features that affect climate

Nitella [24]

Latitude and ocean currents are the ones i know.

4 0

3 years ago

What information can the positive and negative numbers on a number line provide?

Sonbull [250]

Answer:

It can provide if a number is greater than zero or less than zero

Explanation:

6 0

3 years ago

List 3 factors that can speed up the rate of chemical reactions

zysi [14]

Answer:

Temperature
Greater Surface Area
Catalysts

Explanation:

Temperature

An increase in temperature typically increases the rate of reaction. An increase in temperature will raise the average kinetic energy of the reactant molecules. Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision (Figure. 17.5 “Temperature and Reaction Rate”).

Greater Surface Area

The rate of a chemical reaction can be raised by increasing the surface area of a solid reactant. ... more particles are exposed to the other reactant. there are more collisions. the rate of reaction increases.

Catalysts

A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process. Catalysts typically speed up a reaction by reducing the activation energy or changing the reaction mechanism.

Hope this help!!!

7 0

3 years ago

Read 2 more answers

The initial test results of an EPA study in 1989 and 1990 were not conclusive about the value of biostimulation of indigenous mi

Schach [20]

<h2>The correct answer is (C).</h2>

Explanation:

Biostimulation can accelerate Hydrocarbon removal.

Biostimulation includes the adjustment of nature to animate existing microscopic organisms fit for bioremediation.

This should be possible by expansion of different types of rate constraining supplements and electron acceptors, for example, phosphorus, nitrogen, oxygen, or carbon (for example as molasses).

Then again, remediation of halogenated contaminants in anaerobic conditions might be animated by including electron benefactors (natural substrates), in this manner permitting indigenous microorganisms to utilize the halogenated contaminants as electron acceptors.

5 0

3 years ago