What structure does annelids use? (In your own words) I’ll mark you as brainliest!!

Can someone answer these for me plz

dezoksy [38]

Answer:

jsjs

jejsjsj

Explanation:

vsbsbskdndhskddddnsausbsi

4 0

3 years ago

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Explain how fertilization occurs

alex41 [277]

I'm assuming this in plants.

Brief-ish answer:

"Fertilization in plants occurs when pollen grains are transported from anthers to stigma. When ripe pollen from an anther catches on the stigma of the same kind of flower, each pollen grain sends out a small thread-like tube."

Here's a fuller answer:

"Fertilization occurs after pollination, when pollen grains land on the stigma of a flower of the same species. During this time, a series of events take place leading to the formation of seeds. A pollen grain on the stigma develops a tiny tube that runs down the style of the ovary. The pollen tube contains a male gamete which meets the female gamete in the ovule. Fertilization occurs when the two gametes combine and their chromosomes join. The resulting product is a normal complement of chromosomes, with some from either parent flower. The fertilized ovule forms a seed, which consists of a food reservoir and an embryo that later develops into a new plant. In gymnosperms (conifers) male gametes are enclosed in pollen grains and are transmitted by wind or insects to the female reproductive organs. Fertilization in angiosperms (flowering plants) occurs when insects or other animals transport the pollen to the female reproductive organ (pistil).
Fertilization is the fusion of gametes to launch the development of a new individual organism. In animals, the process entails the combination of ovum with a sperm, leading to the development of an embryo. Fertilization in plants occurs when haploid gametes meet to create a diploid zygote, which eventually forms an embryo."

source: https://www.reference.com/science/plant-fertilization-occur-ccf48c80e72fc410

5 0

3 years ago

Silent or missense mutations are small-scale mutations that occur when

Andrei [34K]

Answer:

c. a single nucleotide is substituted with no effect

on the amino acid sequence.

Explanation:

silent mutations occur when the change of the dna

sequence within protein - coding portion of a gene

does not affect the sequence of amino acids that

make up the protein. this change typically takes

place at the third position of the codon also known

as the wobble position.

7 0

2 years ago

The human body uses a variety of organic molecules as sources of energy. In what order does the body usually access these source

horsena [70]

There are 3 sources of energy, which are also known as macronutrients ,carbohydrates, protein, and fat.

Of these three, carbohydrates are the body’s preferred source of energy. Carbohydrates break down into glucose, which is an immediate source of energy especially for the brain and muscles. The macronutrient proportions recommended for general, healthy diet are: 45-65% of energy (or calories) from carbohydrates, 10-20% of energy (or calories) from protein and 20-35% of energy (or calories) from fat.

4 0

3 years ago

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CHAPTER ONE THE CHEMICAL COMPONENTS OF THE CELL Biology Form Three Student Book

Dmitriy789 [7]

1. Almost 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Only about 0.85% is composed of another five elements: potassium, sulfur, sodium, chlorine, and magnesium.
2. The four most abundant elements in the human body – hydrogen, oxygen, carbon and nitrogen – account for more than 99 per cent of the atoms inside you.

7 0

3 years ago