which of these is a concern about the use of biotechnology

Concrete is a composite, since it is composed of various elements like, sand, gravel & water. When mixed together with the proper measurements, it produce cement which is used for building construction, road concreting, etc.

Answer:

Option D, It’s a composite because it’s a mixture of cement, sand, and other granular pieces.

Explanation:

Composite is a mixture which is prepared by blending different substances possessing different physical and chemical properties.  

In case of concrete, the ingredients are -

a) Cement  

b) sand

c) aggregate (granules)  

d) Wire mesh, iron rods or any other substance that has high tensile force.

Here,  the cement acts as a matrix and the gravels and aggregate act as reinforcement. Concrete at the stage of placement is further reinforced by wire mesh or iron rod. Since concrete is good in compressive strength but weak in tensile strength, iron rods provide tensile strength to concrete mix.

Thus, concrete being a mixture of different substances is considered a composite mixture

Answer: Even though they failed as a textile producer, some of the gypsy moths escaped and established their first U.S. population in Med ford, Massachusetts.

Explanation:

The right option is OTEC

Ocean Thermal Energy Conversion (OTEC) uses the temperature difference between deep cool ocean water and warm tropical surface waters to produce electricity. Quantities of cold water that can be used for air conditioning is produced as a by-product.

The growth of cloud droplets and the growth of ice crystals differ primarily in the mechanisms by which they grow and the conditions under which they form.

Cloud droplets grow through the process of condensation. When water vapor in the air encounters cooler temperatures, it can condense onto tiny particles called cloud condensation nuclei (CCN). As more water vapor condenses, the droplets grow in size. This process is most effective at temperatures above freezing (0°C or 32°F). The growth rate of cloud droplets by condensation alone is relatively slow because the saturation vapor pressure with respect to liquid water is low.

In contrast, ice crystals can grow by several mechanisms, including deposition (also known as sublimation), where water vapor directly changes into ice without becoming liquid first. This process is most efficient at temperatures below freezing. Ice crystals can also grow by the Bergeron process, where they grow at the expense of supercooled water droplets (liquid water below 0°C) in a cloud. When water vapor deposits onto an ice crystal, it releases latent heat, which can lead to a faster growth rate compared to cloud droplets. Additionally, ice crystals can collide and freeze onto each other, a process known as aggregation, leading to rapid growth and the formation of snowflakes.

Furthermore, the saturation vapor pressure with respect to ice is lower than that with respect to liquid water at the same temperature. This means that ice crystals can grow by deposition at lower relative humidities than required for the growth of cloud droplets by condensation. This difference in saturation vapor pressure drives the Wegener-Bergeron-Findeisen process, which is a dominant mechanism for ice crystal growth in mixed-phase clouds.

In summary, cloud droplets primarily grow by condensation of water vapor above freezing temperatures, while ice crystals can grow by deposition, the Bergeron process, and aggregation, with deposition and the Bergeron process being particularly efficient below freezing temperatures. The different growth mechanisms and temperature dependencies lead to distinct growth rates and environmental conditions for the formation and development of cloud droplets and ice crystals.

Answer:

A) The planets' orbits are circles in a geocentric model

Explanation:

Answer:

Option C, Evolutionary Tree

Explanation:

An evolutionary tree represents organism in a flow diagram representing the evolutionary relationship between them.

In this tree, species or groups of organisms are placed at the tip of line representing tree branches.  When a branch of this tree further splits into two or more minor branches, this represents the descendant group originating from a single group.  

Hence, option C is correct.

The zebra mussel is a tiny, free-swimming, easily dispersed species that can cling to nearly any hard surface.

An ecosystem is an area where a bubble of life is created by plants, animals, and other organisms interacting with the weather, geography, and other factors. Abiotic variables, or nonliving components, coexist with biotic components in ecosystems.

The four ecological types are classified as man-made, terrestrial, lentic, and lotic ecosystems. Biomes are climatic systems of life and species, and ecosystems are a part of biomes.

It supports life and regulates crucial ecological processes. played a part in the transfer of nutrients between biotic and abiotic elements. It aids in preserving an ecosystem's regular energy flow, which includes the carbon, energy, nitrogen, oxygen, and water cycles.

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World Health Organization (WHO) is an organization that works to ensure that children throughout the world receive vaccinations for diseases that cause serious illnesses and disabilities. WHO partners with government and non- government organizations to provide collective actions needed to ensure that every child is protected from vaccine-preventable diseases.

Answer:

Its a ll only

Explanation:

The statement "They become the reactants of cellular respiration" is true about the products of photosynthesis. The reactants of photosynthesis are carbon dioxide and water, which are combined with light energy to produce glucose and oxygen gas as products. Hence option D is correct.

Photosynthesis is the process by which green plants and some other organisms convert light energy from the sun into chemical energy in the form of organic molecules such as glucose.

On the other hand, cellular respiration is the process by which cells in organisms break down organic molecules such as glucose to release energy for cellular activities.

The reactants of cellular respiration are glucose and oxygen gas, which are converted into carbon dioxide, water, and ATP (adenosine triphosphate) as products.

Thus, the products of photosynthesis, glucose and oxygen gas, become the reactants of cellular respiration. During cellular respiration, glucose is broken down into carbon dioxide and water, and energy is released in the form of ATP.

The released carbon dioxide and water are then recycled and used as the reactants for the next round of photosynthesis.

Hence option D is correct.

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The ground tissue in plants is similar to animal organs.

The ground tissue of plants incorporates all tissues that are neither dermal nor vascular. It very well may be isolated into three kinds dependent on the idea of the cell dividers. Parenchyma cells have thin essential dividers and generally stay alive after they end up developing.

The rusty crayfish is harmful to native species of crayfish because it clear cuts the bottom of waterways leaving native species without a food supply. This statement is True.

Crayfish are defined as freshwater crustaceans belonging to the clade Astacidea, which also contains lobsters. They are also known as crayfish, crayids, crabobs, crawdaddies, crawdads, freshwater lobsters, mountain lobsters, rock lobsters, mudbugs, bebugs, or yabbies.

More than half of the more than 500 species are found in North America where almost all live in freshwater, although some species are found in brackish or brackish water.

Crayfish are characterized by a fused head and thorax, or segmented body midsection, that is sandy yellow, green, red, or dark brown in color. Some fishes like Rusty crayfish are harmful due to clear cuts the bottom of waterways leaving native species without a food supply.

Thus, the rusty crayfish is harmful to native species of crayfish because it clear cuts the bottom of waterways leaving native species without a food supply. This statement is True.

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All lipids are hydrophobic, meaning they do not dissolve in water. This results from their predominantly nonpolar carbon-carbon and carbon-hydrogen bonds.

All lipids, which are a type of macromolecule, share one fundamental attribute: they are hydrophobic, meaning they do not dissolve in water. Instead, lipids tend to cluster together when in a water-based environment. This hydrophobic quality results from the predominantly nonpolar carbon-carbon and carbon-hydrogen bonds that make up most of a lipid's structure. Other examples of lipids include fats, oils, and waxes.

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The total amount of matter and energy remained the same. They only change their forms and locations in the ecosystem. Thus, the correct option is A.

The energy flow in an ecosystem takes place through the food chain and food webs. During the process of energy flow in the ecosystem such as grassland ecosystem, the plants or grasses being the producers absorb sunlight with the help of their chloroplasts and a part of it is transformed into chemical energy in the process of photosynthesis in the plants.

Similarly, as the matter cycles within an ecosystem, the atoms are rearranged into various molecules, but no new matter is created or destroyed. So, during all the ecosystem processes, both energy as well as matter are conserved.

Therefore, the correct option is A.

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Final answer:

The gradient of a river affects its flow by widening the channel, slowing down the current, and increasing the deposition of sediment. The water becomes less clear, warmer, and has a higher concentration of silt. This can impact the ecosystem and the behavior of organisms in the river.

Explanation:

As the river or stream flows away from the source, the width of the channel gradually widens, the current slows, and the temperature characteristically increases. The increasing width results from the increased volume of water from more and more tributaries. Gradients are typically lower farther along the river, which accounts for the slowing flow. With increasing volume can come increased silt, and as the flow rate slows, the silt may settle, thus increasing the deposition of sediment. Phytoplankton can also be suspended in slow-moving water. Therefore, the water will not be as clear as it is near the source. The water is also warmer as a result of longer exposure to sunlight and the absence of tree cover over wider expanses between banks. Worms (phylum Annelida) and insects (phylum Arthropoda) can be found burrowing into the mud. Predatory vertebrates (phylum Chordata) include waterfowl, frogs, and fishes. In heavily silt-laden rivers, these predators must find food in the murky waters, and, unlike the trout in the clear waters at the source, these vertebrates cannot use vision as their primary sense to find food. Instead, they are more likely to use taste or chemical cues to find prey.

Answer:  The correct option is d. the improvement of the microscope and microscopic techniques.

In the 1600s the development of cell theory was led by advances in microscopy.  The cell theory is historic in terms of scientific theory. According to the theory it was proposed that all living organisms are made up from cells, cell is the basic structural unit in all the organisms and new cells arise from pre-existing cells. The continuous improvement of microscopy with time and advancements in magnification technology were enough for discovering the cells and contributed the most towards the cell theory.

1.       The answer is morphology. This is the use of similarities  and differences in physical characteristics of the organisms. In addition to morphology, today, the use of genetic comparisons have helped phylogenetics to have higher fidelity. 

2.       The answer is Mesozoa. The group is composed of maily marine invertebrates that are worm-like in characteristic and are usually ciliated.  Dicyemida and Orthonectida are the two main groups of the Mesozoa phylum.

3.       The answer is arthropods. This is because the phylum is mostly comprised of insects (Class Insecta has over 800,000 discovered species). Insects are the most abundant organisms on earth and also the most diversified. Again every molt and metamorphosis of these insects presents a different instar in the organisms.  

4.       Fish are entirely aquatic while amphibians are not. Amphibians can survive in land in their adulthood. Amphibians have larvae stages hence metamorphose. Fishes on the other hand rarely metamorphose.  Adult amphibians have limbs while fishes have fins.  Examples of amphibians are frogs and tortoises. Examples of fishes are sharks and catfish

Answer:

Solar energy, biogas, Electric energy.

Explanation:

Although solar energy and biogas are types of renewable energy that guarantee little impact on nature, the best alternative to generate electricity at home is still electricity. This is because solar energy can only generate electricity when the sun is available, that is, there would be no electricity at night and during winter. In addition, installing solar panels is very expensive. The price would also be a problem in the use of natural gas, since its use is usually very expensive. In that case, the best option would be electricity.

However, we cannot forget to point out that the combined use of the three energies would be great for a home, since it would bring savings and reduce the environmental impact.

Morphology refers to the branch of biology which deals with the study of the structure and the structural features of the organisms. It includes the study of the shape, size, colour, pattern and other physical features of an organism. The word morphology is derived from the two greek words "morphe" meaning form and "logos" meaning study. It can be further classified into comparitive morphology, gross morphology and molecular morphology.

The study of the outward appearance of an organism is referred to as external morphology and the study of the internal details of the organism and its structures is referred to as internal morphology or anatomy. It helps in better understanding at the cellular level of an organism revealing both the macroscopic or the gross anatomy and microscopic anatomy.