Biology, 02.04.2020 02:36 twinkie7078

Where should the loss of flagellated sperm be marked on the phylogenetic tree?

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Answer from: 2002babygurl

Options have not been provided. They are as follows:

a.) At the base of seed plants

b.) Both at the base of angiosperms and at the base of the gnetophytes, pines, and redwoods clade

c.) At the base of the gnetophytes, pines, and redwoods clade

d.) At the base of angiosperms

b.) Both at the base of angiosperms and at the base of the gnetophytes, pines, and redwoods clade

Explanation:

The phylogenetic tree of plants was made according to several characteristics. When vascular tissue made entry in the tree, it got divided into seedless vascular plants and seeded vascular plants. Till this time flagellated sperm was observed in plants.

When the seeded vascular plants were further divided into angiosperms and gymnosperms, flagellated sperm was first lost at the base of angiosperms. None of the angiosperms have flagellated sperms. Gymnosperms further got divided into two clades. The clade containing ginko and cycads still retained the flagellated sperm. But the clade consisting of gnetophytes, pines and redwoods lost flagellated sperm. So the characteristic of flagellated sperm was lost again at the base of gnetophytes, pines, and redwoods clade .

Hence, loss of flagellated sperm should be marked on the phylogenetic tree both at the base of angiosperms and at the base of the gnetophytes, pines, and redwoods clade .

Answer from: Quest

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

explanation:

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Answer from: Quest

the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation:

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