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Lena [83]
3 years ago
8

What evidence links echinoderms, hemichordates and chordates to the same evolutionary lineage?

Biology
1 answer:
sleet_krkn [62]3 years ago
5 0

Answer:

Embryological evidence

Explanation:

Deuterostomes is a group that includes echinoderms, hemichordates, and chordates. Although these animals exhibit a wide variety of body plans, they share a mouth secondarily formed during embryo development, which it is believed to be an evolutionarily derived character present between a common ancestor and all its descendants (i.e., a synapomorphy). This oral cavity is formed by the invagination of the ectoderm layer opposite to the blastopore of the gastrula.

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Answer:

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Explanation:

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What is the correct order of events in the sliding filament theory of muscle contraction? 1. Myosin head binds to actin 2. Calci
valkas [14]

Answer:

The correct order is: 6) Sarcoplasmic reticulum releases calcium ions, 2) Calcium ions bind to troponin, 5) Tropomyosin moves to expose active sites of actin, 4) ATP is split into ADP and P, 1) Myosin head binds to actin, 7) ADP and P released from myosin, 3) Myosin cross-bridges bend, pulling actin toward center of sarcomere.

Explanation:

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7 0
3 years ago
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OLga [1]
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3 years ago
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What does research say about the relationship between birth order, sibling spacing, and intelligence?
vesna_86 [32]

Answer:

"Birth order and sibling spacing are unrelated to a child's intelligence."

Explanation:

The theory, put forward by Robert Zajonc, a psychologist at the University of Michigan, holds, in brief, that the greater the number of children in a family and the shorter the time between their births, the lower will be the intelligence of the children, particularly those born later. A mother's genetics determines how clever her children are, according to researchers, and the father makes no difference. Women are more likely to transmit intelligence genes to their children because they are carried on the X chromosome and women have two of these, while men only have one.

6 0
3 years ago
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Juliette [100K]

Answer:

<em>The correct option is B) Capillary action, when adhesive forces are stronger than cohesive forces.</em>

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When water leaves from the leaves of a plant through events such as transcription, a gap is produced in the capillary action of the xylem tube. As a result, more water is drawn from the roots to fill the void. The forces of attraction between the water and the xylem tube are much greater than the intramolecular forces of water. As a result, the water flows in an upward direction due to these string adhesive forces present between the water and xylem tube.

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