What are the environmental pressures of the plant the cactus? What are their Variations?

Biology

1 answer:

finlep [7]3 years ago

6 0

Answer:

The best-known threat comes from human pressures, driven by agriculture, residential, and commercial expansion into cactus habitats. But the worst offender, the scientists were surprised to find, is the illegal trade of cactus plants and seeds, affecting 47 percent of the threatened species.The pressures of drought and other animals, as well as lack of water are environmental pressures of the Cactus. The environmental pressures of the cactus are the variations are Bunny Ears Cactus, Chin Cactus, Saguaro Cactus, Old Lady Cactus, Star Cactus, Easter Cactus, Christmas Cactus, and Moon Cactus

Explanation:

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Local anesthetics, like lidocaine and novocaine, reduce the perception of pain by:__________. A. blocking transmission of impuls

stich3 [128]

Answer:

The correct option is A.

A. blocking transmission of impulses from the spinal cord to thalamus

Explanation:

Local anesthetics, like lidocaine and novocaine, reduce the perception of pain by blocking transmission of impulses from the spinal cord to thalamus because local anesthetics they first bind to ion channel in the nerve cell and then inhibit function of the ion channel present in the membrane of nerve cell known as sodium channel. This later cause blockage of nerve impulses at the site where the injection was given from the spinal cord.

7 0

3 years ago

Plz help ASAP! THANK YOU

marysya [2.9K]

Answer:

According to the diagram, what is occurring in step 7 is cytokinesis, with the separation of two daughter cells, following cell division.

Explanation:

Cytokinesis is a process that occurs at the end of mitosis or meiosis, being the final step of cell division. This mechanism allows the separation of the two daughter cells, with equal distribution of cytoplasm and formation of cell membrane, differentiating into two independent cells.

In the diagram it can be observed (step 7) that after the division process —in yellow— two arrows pointing to two cells are evident, which implies the process of cytokinesis.

Prior to the cytokinesis process, karyokinesis occurs, which is the separation of nuclei and formation of the nuclear membrane.

In animal cells, karyocinesis occurs by the effect of a ring of actin and myosin that helps to force the separation. In the plant cell, the fragmoplast is formed, a septum that induces the separation of the daughter cells.

The other options are not correct because: