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Darya [45]
3 years ago
11

"During embryonic development red blood cells begin to develop in patches called blood islands. The blood cells secrete growth f

actors that diffuse only to nearby cells, signaling differentiation into endothelial cells. The endothelial cells eventually form the linings of the blood vessels." The growth factor described in the passage is involved in what type of signaling?a. Autocrine
b. Paracrine
c. Endocrine
d. Juxtacrine
Biology
1 answer:
Elanso [62]3 years ago
7 0

Answer:paracrine

Explanation:glands are specialized tissues that secrete specific chemicals substances.these substances may be enzymes,hormones or lubricating fluid.glands secretes their their products through several mechanisms.some involve the use of ducts ,while others do not.

In paracrine secretion,the secretory products reach their target cells by diffusion through the extracellular space or adjacent connective tissue.

Paracrine secretion do not use ducts.

Similar to paracrine is the endocrine ,in which the secretory products goes through the basal lamina ,into the underlying connective tissue and into the vascular syatem.they too do not use ducts

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in photosynthesis, electrons that travel through the electron transport chain in the thylakoid membrane come from ?
Masja [62]

Answer:

water molecules

Explanation:

In photosynthesis, electrons that travel through the electron transport chain in the thylakoid membrane come from water molecules.

Water molecules supply electrons for electron transport in photosynthesis.

5 0
3 years ago
Explain the statement “Scientific knowledge is the result of debate and conformation within the scientific community.”
spayn [35]

Answer:

What this statement means is that experimentation is not enough, but that true knowledge comes from the analysis of results in a critical and meticulous way

Explanation:

Scientific knowledge is based on the scientific method and the results of the research, however that information is useless if it is not interpreted.

When the results are analyzed by scientists who support the same theories and have the same opinions, the results are not enriched as much as when exposed to different points of view. The debate tests the hypothesis giving rise to more complete answers.

6 0
3 years ago
Some familiar products contain some of the same types of atoms. For instance, the chemical formula for baking soda is NaHCO3. Th
PolarNik [594]

Answer:

B

Explanation:

6 0
2 years ago
Read 2 more answers
Birds are the main predators of these beetles; they hunt the beetles by sight and pick them off the tree bark where they feed. A
Alinara [238K]

Complete question:

1. The graph below depicts the frequency of expression of the coloration of beetles on an island:

Graph is the 1st Pic --> Attached files    

Birds are the main predators of these beetles; they hunt the beetles by sight and pick them up off of the tree bark where they feed. A logging company clears the trees off of the island and plants younger trees as a replacement. Trees with light bark are planted on one side of the island and trees with dark bark are planted on the other side of the island. What do you predict would happen to the range of coloration in the populations of beetles on each side of the island?

Select TWO answers, one to represent the beetles living on the light colored trees and one to represent the beetles living on the dark colored trees. (2 points)

A. graph 2 below

B. graph 3 below

C. graph 4 below

D. graph 5 below

Answer:

B. graph 3 below

D. graph 5 below

Explanation:

The original population of beetles (Graph 1) shows that most individuals had an intermediate phenotype between dark and light color. The graph expresses its highest point in the middle of the phenotypic ax, while the curve´s tails coincide with light and dark colors.

Probably, most of the trees inhabiting the whole island had some darkish color tone, which beetles used to camouflage and avoid predation.

When the company cleared the area and reforested, they planted light trees on one half and dark trees on the other half of the island. This change in the environment modeled the beetled phenotype, together with predation pressure.

<em>If we consider the whole original population, we should say that it went under a disruptive selection.</em> But if we think about the sides of the island separately, we could say that the population living on each side went under directional selection. We are not thinking about the whole population of beetled inhabiting the whole island, but two groups inhabiting each side of the island.

  • Graph 3 represents the beetles inhabiting the part of the land with dark trees. The population went under directional selection, and most of them turned into dark-colored to camouflage with the substrate in which they live.
  • Graph 5 represents the beetles inhabiting the other part of the land with light trees. The population went under directional selection, and most of them became light-colored to camouflage with the substrate in which they live.

8 0
3 years ago
How does pollution threaten coral reefs? Answer using at least 3 complete sentences.
Lostsunrise [7]

Answer:

When pollution occurs on land it travels to the waters which causes the pollutants to enter the water. When pollution enters the water, it damages the algae on the coral. It also lowers water quality, smother the coral reefs, and it speeds the growth of the damaging algae. All these make the coral reefs more susceptible to disease which stops the reefs growth and reproduction.

Explanation:

hope this helps

7 0
3 years ago
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