Spores of the first known terrestrial plants have been found in what strata

1 answer:

8 0

The answer to this question is the Silurian strata. These are spores of the Psilophytes which appeared at the end of the Silurian period. The spores have been found in early Silurian rocks in Libya. Psilophytes did not have roots or leaves, but has branches carrying spore sacs that grew from an underground vine.

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Can more than one dichotomous key be developed to identify the same group of organisms? Explain. To answer this question, refer

rewona [7]

Certainly. Every organism has a variety of different characteristics. One person writing a key might choose to use different characteristics than another person would use.

For example: Here's a key for separating fish, snake, frog and mouse

1.
A. Has scales on its skin ... 2
B. Has no scales on its skin ... 3

2.
A. Breathes with gills - fish
B. Breathes with lungs - snake

3.
A. Has hair or fur - mouse
B. Has no hair or fur - frog

Here's a different key for the same four animals:

1.
A. Has four legs ... 2
B. Does not have 4 legs ... 3

2.
A. is warm-blooded - mouse
B. is cold-blooded - frog

3.
A. has fins - fish
B. has no fins - snake

8 0

2 years ago

HUMERO - DELTOIDES - COSTILLAS – TIBIA – CODO – BICEPS – ADUCTOR – MUÑECA – CUBITO – PECTORAL – CADERA – GEMELOS– VERTEBRAS – CL

professor190 [17]

Answer:

Huesos: HUMERO, COSTILLAS, TIBIA, CUBITO, VERTEBRAS, CLAVICULA, ROTULA, FEMUR, OMOPLATOS, FALANGES.

Músculos: DELTOIDES, BICEPS, ADUCTOR, PECTORAL, GEMELOS, DORSAL, CUADRICEPS, IZQUIOTIBIAL, CORAZON, ABDOMINAL.

Articulaciones: CODO, MUÑECA, CADERA, TOBILLO, HOMBRO, CRANEO.

Explanation:

Los huesos son órganos que tienen la función de dar estructura, protección y soporte al cuerpo. A los huesos se le unen los músculos, los cuales hacen que los huesos se muevan al contraerse estos. Las articulaciones unen los huesos entre sí y permiten junto con los músculos el movimiento del cuerpo y de sus diferentes partes.

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2 years ago

Hhv-5 infectious in pregnant women can be particular concern because this virus can be?

kow [346]

Hhv-5 infectious in pregnant women can be particular concern because this virus can be teratogenic.

<h3>What is teratogenic?</h3>

Teratology is the study of aberrant physiological development across the whole life cycle of all species, including plants.
Dysmorphology is a branch of medical genetics that focuses on the classification of congenital deformities.
Teratogens are substances that, when exposed to a pregnant woman, may result in physical or functional abnormalities in the human embryo or fetus.
Such substances include, for example, alcohol and cocaine.
A teratogen is an agent that increases a baby's risk of developing a birth defect or can actually cause one.
They are items to which a mother might be exposed while expecting.
Teratogens can result in neural tube abnormalities like spina bifida during this time.
Throughout the entire pregnancy, certain organs are vulnerable to teratogens.
The baby's brain and spinal cord are included in this.
Alcohol can be harmful at any point during pregnancy since it has an adverse effect on the brain and spinal cord.