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miskamm [114]
3 years ago
8

Which of these is a central purpose of steroids in mammals? Choose the correct answer. A)They form protective coatings. b)They s

erve as chemical messengers. c)They provide most of the energy for a cell. d)They break down bonds in polymers by adding water.
Biology
2 answers:
MatroZZZ [7]3 years ago
8 0

Answer:

They serve as chemical messengers.

Explanation:

Steroid may be defined as the molecule that are made of large number of non polar molecules and are hydrophobic in nature. The cholesterol is an important steroid present in mammals.

Steroids as a precursor for the formation of the important hormones. Steroidal hormones plays an important role in the growth and metabolism of the organisms. The sex hormone are also made of steroids. They regulate the chemical messages in the body.

Thus, the correct answer is option (b).

denis23 [38]3 years ago
5 0

Ans.

Steroids are defined as active organic bio-molecules, having four rings with a specific molecular configuration. Steroids play role in two major functions: as hormones or signaling molecules and as structural components of plasma membrane.  

Examples of steroid hormones are estrogen, progesterone, and cortisol. Thus, the correct answer is 'option b). they serve as chemical messengers.'

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Deep scratches have been found in the rocks of South Africa - scratches that can only be made by glaciers (big blocks of ice). W
earnstyle [38]

Answer:

This says that a very long time ago South Africa could have had glaciers and had a cold climate were as now South Africa has a very hot and humid climate.

8 0
3 years ago
THIS IS A TEST GRADE! PLZ HELP ME
antoniya [11.8K]

Answer:

Photosynthesis

Explanation:

The diagram shows a picture of a plant cell. Plants produce most of their energy through photosynthesis. The arrows also show the major reactants and products of photosynthesis.

6 0
3 years ago
Think about challenges related to marine science which are currently facing society. In coastal and inland communities alike, th
Alex_Xolod [135]

Global challenges related to marine science are as follows:

1. Ocean acidification is a major issue that affects all of the world's ocean industries and has severe negative effects on the environment, society, and the economy. Coordinated government action is required to effectively address this issue.

<h3>What is impact of ocean acidification?</h3>

Ocean acidification will affect the biological, biogeochemical, and ecological aspects of the oceans, and while the effects on the environment, the socio-ecological system, and human dimensions are all still not fully understood, they have the potential to have very dramatic effects. Numerous marine ecosystem services and goods may be impacted directly or indirectly. Industries that rely on these services from the Ocean are impacted.

2. Overfishing:

Overfishing poses a severe threat to the fish in our water, whether it's for the food industry or the aquarium sector. The Food and Agriculture Organization estimates that more than half of the species of marine fish have been totally or overexploited, despite the fact that many of them simply need to remain in the sea because they are not necessary for food security or because they cannot survive in captivity. We are killing entire ecosystems and the food chains that are necessary to keep them healthy by overfishing. Overfishing not only causes the extinction of entire species, but it also directly affects other species in the food chain.

3. Plastic

Between 1.15 and 2.41 million tons of plastic enter the ocean every single year. The Great Pacific Garbage Patch, which is a collection of rubbish in the Pacific Ocean is now three times the size of France. Animals can get tangled in the huge amount of plastic which litter the ocean, and the plastic smothers and destroys coral and sponges. Plastic bags are also often mistaken for food by sea turtles, and they either become trapped or eat the bag which clogs their digestive system. Plastic continuously breaks down resulting in little pieces of “micro-plastic” that are consumed by a variety of marine life, including several species that humans like to catch and eat.

solutions that account for societal needs and wants:

1. Cutting back on carbon emissions.

2. Reducing plastic usage.

3. Making sure the fish you consume is supplied sustainably and ethically.

4. Participating in beach cleanups.

5. Only purchase aquarium fish that were raised in captivity.

6. Supporting elected officials that favor a wholesome atmosphere

7. Contributing to environmental organizations that protect our oceans.

For more information regarding ocean acidification, visit:

brainly.com/question/7604502

#SPJ1

8 0
2 years ago
The nervous system works through secretion of
8090 [49]
Acetylcholine..

hope it helps
6 0
3 years ago
If one population is nearly decimated, it has no affect another population if the second
natita [175]
False, because if the second population depends on the first as a food source then if the first decimates then the second will also start to decimate
6 0
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